Install an EVi Pool
IN 8 EASY STEPS
POSITION, PLACEMENT & SCHEDULING A START DATE
HOW WILL WE GET THE POOL INTO POSITION?
Before you start to plan any part of the pool installation, the first thing that should be checked is if you need planning permission. Usually a pool falls within permitted development however if it is outside the scope of permitted development the process of applying is very straightforward and is very rarely declined. This applies to not only the pool installation at the property but any other applications that need to be made to relevant local council departments. For example if a road closure may be required. The applications for which should be made in advance of any plans.
Reasons you may need planning permission:
● If you live in a listing building
● If you are located in an area of outstanding natural beauty
● If your house has had permitted development removed
● You want to build the pool forward of the front elevation of your property
● You want to raise the pool more than 300mm out of the ground
The process of applying and gaining permission for a road closure can take up to 16 weeks.
Plan your access. If you are inexperienced in pool delivery it is advisable to pay for a
pre-installation consultation from an EVi representative in the initial planning stages to advise on the best route of delivery from door to base.
The pool can either be moved into place by a crane or an excavator.
Once you have decided on the best route of delivery you will need to consult either a crane hire company or an experienced groundworks company to provide a plan for the safe and correct lifting and moving of the pool.
You will also need to select a delivery date with EVi Pools when paying the deposit. This will be a minimum of 6 weeks from the date of cleared funds.
Once the delivery date has been selected it cannot be changed without incurring additional charges. When planning the lifting, the pool weight can be found in the EVi Construction
Specification document, please refer to the technical drawings for pool dimensions.
WHERE IS THE BEST PLACE FOR THE POOL?
Deciding on ideal pool placement is an integral part of a pool that not only runs
well but is easier to maintain and looks great too.
Below are the most important points that should be considered when deciding on
the best location.
The pool position should be:
■ A minimum of 2 m away from any building, fence or brick wall (unless you
have consulted a structural engineer)
■ Complimentary of sun rise and set locations. There are some great apps
available to download to help you with this.
■ A maximum of 8m away from the Pool Pod measured by the closest corner
of the pool.
The pool position should not be:
■ Too far from the house so that you can easily run services- power, water and
drainage to the intended pool location
■ Under any trees
■ At the bottom of a slope
■ Raised off the ground more than 30cm (unless you consult a structural
engineer and install retaining walls)
Think about the elevation of the pool and the slope of the ground. The pool should not be at the bottom of a slope and cannot be raised out of the ground more than 30cm. This is for structural and planning reasons. If this is not possible, you will need to consult a structural engineer and install retaining walls.
Normally when designing the falls of a patio, the falls will be away from the swimming pool to prevent any surrounding water from entering the swimming pool. It is normal practice to allow 2 cm per 1 m of patio for the fall. So, if your patio is to be 4 m wide, your pool will have to be 8 cm above the surrounding ground level.
Taking all of this into consideration once you have decided the position of your pool, please re-consult your Pool drawing, this will give you the dimensions of the pool shell, the visible water area and the excavation size.
Use this and string lines to peg this out the shape of the pool in the exact, intended location (always taking a diagonal measurement to check that the box that you pegged out is square). This will also give the customer the opportunity to see the potential location and check that they are happy. Once all has been checked it can be sprayed in with line marker spray.
At this point consider the intended location of the Pool Pod and trench. The dimensions of the Pool Pod are available in your Pool drawings. The PoolPod should be placed a minimum of 1m from any boundary to ensure that the heat pump falls within permitted development (if applicable) and should also be a maximum of 8 m away from the closest corner of the pool. This is to ensure
that the water flow to and from the pool is sufficient for the pumps and filters, there
is not an excess heat loss through the pipes and to ensure the running costs are not too high for the client. The heat pump should also have 2.5 m of clear airspace in front of it and it should not be in an enclosed area. This is to ensure that it operates efficiently and that the
cold air is not recirculating back onto the air inlet as this will cause serious problems
in the pool’s ability to heat itself.
Once you have decided the location of the Pool Pod, plan the location of the trench. Running a direct line from the Pool Pod back to the closest corner of the pool (a maximum of 8 m). The Trench should measure 450mm wide x 650mm below finished level.
Contact us when you are ready to schedule a start date.
EXCAVATION & GROUNDWORKS
To prepare for the excavation for the pool, begin with your pegged area that you have marked using your excavation drawings, however this time you will need to measure the pool depth too.
The excavation drawings will give you the total excavation depth from the finished pool level ensuring that this allows for the slopes of the patio to go away from the swimming pool at a rate of 2 cm per 1 m.
Once you have pegged out the total pool area, you will need a laser level. You will set this on the datum point, which is normally a peg that you’ve put in the ground at the finished level.
Your laser should have a MM read out on the detector for setting the form work.
Start your excavation at one end, working your way backwards. Depending on the soil type you may need to complete some extra preparation work. For example, benching the sides of the excavation at 45 degrees if the soil is unstable for any reason.
However, this will increase the cost of the backfill material as you will need more of it. Please bear this in mind from the start.
If the ground is soft at the base of the excavation it will need a ground bearing test
as we require ground capable of supporting 100 kN/m2.
Once you have finished your excavation you can excavate the trench from the pool to the Pool Pod.
If access on the site is restricted this may have to be done before the excavation of the pool. This should be a minimum of 450 mm wide, usually the width of the excavator bucket and a depth of 600 mm below your finished patio level or where the ground level will be.
You will then need to line it with sharp media ready for the pipework and electrical conduits.
You will need a 150mm reinforced concrete base for the pool and one 100mm base
for the Pool Pod.
Before laying the concrete you should start by applying a layer of damp proof membrane at the bottom to ensure the concrete doesn’t dry or wet too quickly.
You will need a timber formwork, normally 6 x 2 timbers to form the base. You will put this in with stakes and use your laser level to put the formwork all the way around the edge at the correct level.
Then, you will need a142 reinforcing mesh with either rebar chairs to upstand the rebar off the base of the pool by 75mm. The rebar should not be walked on once laid and should be in the middle of the concrete slab. It should also not touch the edges of the concrete formwork. So as to fully enclose it in concrete.
Given the amount of concrete, it is advisable to use a concrete pump, you will need C30 concrete minimum or above, with a maximum slump of 100. You will also need a bull float and tamp bar to ensure the concrete is laid smoothly.
Once the concrete has been laid, you will need a minimum of three days of drying time in good weather.
If for any reason, your pool is not plus or minus 7 mm, you will need to enlist a professional liquid screed company and have a layer of liquid screed added on top of this concrete base.
However, this will increase your finished level by over 40mm. So If you are not confident in getting the concrete base perfectly level when installing it, it is recommended that you account for this and budget for this from the start.
You will then need to install your Pool Pod base. For this-you will need 4 x 1 timber.
The dimensions of this base are shown in your excavation drawing. You can you can pour this at the same time as your pool concrete base. It is recommended to use an edging trowel on the edge of this base. You may need additional formwork to allow the pipes to come up to the left hand side of the Pool Pod easily.
DRAINAGE & SERVICES
DELIVERY & INSTALLATION
You should now be ready for the pool delivery.
On the day of the pool delivery an EVi Pools representative will be present to assist with the installation operation.
The EVi Pools representative is contracted on-site between the hours of 9.00am and 4:30pm. Therefore it is essential that all the equipment is there and ready to start by 9:00am. You will also need a minimum of 4 people on site for the day as it is going
to be a busy day!
Your pool will be delivered on an Articulated lorry or trailer and will need a space a minimum of 2 cars width to be able to get close to your property. Please ensure the road around the area you plan to unload the pool is clear.
Once the shell is delivered it will need to be lifted. You should have your lifting plan in place from your crane company or groundworks company by now to enable you to move the pool correctly and safely.
Evi Pools will supply a 20mm XPS layer that should be installed on top of the concrete base below the base of the pool prior to loading. This layer is included in your technical drawings.
The pool has four lifting points installed on its structural lip. You will need four small D-ringS rated 2 tonnes minimum and four 3M strops also rated to 2Tonnes minimum each. You may also need lifting chains and a swivel hook to move the pool into position.
Once the pool is lifted into position the level must be checked on each corner with
your laser level on the top of the shell.
PLUMBING & WIRING
Your EVi representative can connect the plumbing of the pool shell and the Pool Pod and perform a pressure test.
It is helpful to have your electrician on-site on the day of delivery so he can discuss with the EVi representative the electrical connections.
After delivery your electrician will need to be on site to move poolside extensions for the following:
These connections will need joining in an IP rated junction box and ran through the trench in suitable conduit back to the plant. The pool cannot be backfilled until this has been completed.
BACKFILL & FILLING WITH WATER
– Remember that the swimming pool is a flexible structure so you must backfill the pool carefully. You should also not put any weight on the walls of the swimming pool other than the backfill or they will bend.
– The pool will be delivered with wooden braces. Do not remove these until your pool is full of water. This is to ensure the pool does not bow inwards.
– Do not walk down the sides of the pool or on the backfill until this has gone off and the pool is full of water.
– Never use soil or gravel for the backfill. It will invalidate the warranty.
14:1 Lean mix (stabilised sand / screed / CBS / Cement bound Sand). Start by putting string lines down each side of the pool so you can ensure the pool does not bow in or out when backfilling. Use the String lines to ensure the pool is straight at all times and keep checking throughout the process.
You should have someone down in the hole packing the material as someone is passing them more material.
Fill the pool up to the first ledge with water, this will stabilise the shell, you can then backfill up to this point. Then further fill the pool adding another 300 mm of water then backfill up to this point. Then carry on up to 200 mm below the top of the pool.
Once you are at the top of the pool, the surround of the pool needs to be poured with a reinforced concrete base for you to lay your patio on top of.
Ensure the pool is not bowing in or out when you begin pouring the concrete and vibrate the concrete as you pour. You can now backfill all trenches first with sharp sand 100mm above all the pipes followed by soil and compact.
POOL SURROUND & COPINGS
You are now ready to complete the final step of the pool installation. Please note that when completing the surround of the pool Softwood decking is not suitable. It gets slippery and splinters very quickly.
Any paving should have an adequate slip rating and should be pendulum slip tested to ensure that it is safe with wet feet and you can not catch your toes on a riven surface. Paving should also be bullnose on the edge facing the pool.
The first line of paving should be stuck to the edge of the pool using a modified polymer adhesive such as ct1 or Innotec.
It will need to be sealed from within the pool using a good quality silicon such as DOW.
START UP, WATER BALANCE & CHEMICALS
Pool Water Level
Maintaining the correct water level in the pool at all times is extremely important. If the water level is allowed to drop or overflow, this can cause irreparable damage to the shell of the pool. Also, if an automatic cover is fitted to the pool an incorrect water level will also damage the slats of the cover.
The correct water level should be level with the centre of the skimmer. The water level must be a min of 2 cm below the coping stones. Please be aware in heavy rain this may overcome the overflow and the water level
should be allowed to drop before opening or closing the cover. Please be aware that, backwashing, evaporation, using the pool will all result in the loss of water, this is normal.
You should check the water level prior to cover operation. The overflow may need
cleaning of leaves periodically.
Starting up the Circulation System (Media Filter)
When the filtration equipment is installed above the waterline of the pool, it will initially be necessary to prime the pump as follows before proper circulation can be achieved.
On the other hand, if the poolpod is below the waterline of the pool , the filtration circuit will prime itself under the pressure of the pool through gravity.
1. Ensure all ball lever valves are closed (Valve handle 90° to pipework travel).
2. Unscrew the pump basket lid, and the filter lid.
3. Using a garden hose, fill the filter to around 75% of its capacity. You can also fill the pump basket as high as possible. Screw both the filter and pump lids back on.
4. Open all the ball lever valves in the pool pod and immediately Turn on the pump.
5. The water should start to flow into the pump after a few minutes. This may look like a trickle or a strong current depending on the volume of water that is in the pipework from pool to plant. You may need to keep repeating the previous steps to keep force feeding water into the system to enable priming to be achieved. Always ensure you turn the pump off before you change the position of any ball lever valves.
6. Once you have achieved a strong current into the pump, you will need to dispel the air in the system via a bleed valve house on the top of the media filter. This is the highest point in the system. This is very similar to venting radiators in homes.
7. The system has been primed, and is fully operational.
To carry out a backwash, follow these steps:
1. Set the multiport valve to “BACKWASH”, switch on the filter pump and backwash the filter (new filter media must be cleaned of small impurities) as described below but for a minimum period of four minutes. As the pipework system is not fully charged with water, it may take several minutes for the
pump to expel the air from the system and start to pump water at full flow. Once full flow is achieved then start to time your backwash. The water will now flush out the finings and impurities in the filter media bed.
2. Either after four minutes or once the water level reaches 25mm above the bottom of skimmer opening, switch off pump, set multiport valve to “RINSE”, switch on pump for approximately 10 seconds to flush debris from pipework, switch pump off and set handle to “FILTER”.
3. Once you have carried out the full backwash procedure, top up water level to the centerline of the skimmer opening if necessary, restart the pump and the pool should be fully operational. Check the pressure gauge reading on the multiport valve or top of the filter tank, depending on the model of filter you have and make a note of this as your “Clean running pressure” for future reference.
We are able to provide basic advice by email or phone. For complicated advice we are unable to help over the phone as we do not want to give incorrect information when we can not see the problem in person.
Engineer On Site help
We can provide onsite Assistance at a Day rate either to assist with installation or
advise. Please call us to book an engineer.