Pool Types Flashcards
(37 cards)
What is a green pool?
Disinfectant-free. Water is purified by passing it over an open-air shallow filter bed that is planted with aquatic vegetation. Sand filters and UV disinfection may be incorporated.
Pool Types?
Concrete, Liner, One piece, Above ground.
What are the different concrete pool methods?
Sprayed concrete, temporary shuttering and permanent shuttering.
How are liner pools made?
Excavating a hole, fitting a frame or shell and finishing with a high quality flexible PVC membrane (Liner). The shell can be made out of materials such as concrete, steel, aluminium, fibreglass or plastic panels. Takes about 4 weeks install. Life expectancy of 10-12 years.
How are one piece swimming pools made?
Prefabricated Glass Reinforced Plastic (GRP). 95% of construction occurs in the factory. All necessary equipment can be fitted in the warehouse. The pool is craned into a pre-prepared excavation with a crushed gravel base. The gap between the pool and the soil surround is filled with gravel. It usually takes 5 days to install.
What are the two common filter types?
Sand filter- Can be made of steel, thermo-plastic or fibreglass. Thermo-plastic and fibreglass are non-corrosive. Cartridge filter- force the water through a man-made filtration material.
How are sand filters cleaned?
Backwashing. The pump is switched off and the position of a rotary or multiport valve is altered. Turning the pump back on thereby reverses the water flow. This expands and agitates the sand bed and the water carries away dirt particles. May only be needed about once a week in the peak system.
How are cartridge filters cleaned?
Switch off the pump, remove the cartridge and soak the element in acidic degreasing cleaning agents. Wash it down before allowing to dry and replace.
What are the finishing options for concrete pools?
The shell is coated with sand and cement wall plaster (render) and a floor plaster (screed). In some cases an additive can be mixed into these to make the pool watertight.
Finishing options include: mosaic tiles, tiles, natural stone, plaster finishes, painting and painting.
How long can liners generally last?
8-10 years.
What are the different type of pool covers?
Sheet covers, heat retention covers,PVC slatted covers, solar blankets,reel systems, winter covers.
What are the different ways a pool can be heated?
Heat pumps, Gas and oil boilers, Direct resistance electric heating, solar panels, indoor pool heating.
What are the different methods of shuttering a concrete pool?
Temporary- shuttering of steel or timber is removed once the poured concrete has set. Suitable for larger commercial contracts.
Permanent- Shuttering in the form of two skins of concrete blocks are often used for domestic installations.
What are the different ways to spray a concrete pool?
Gunite- Dry mixed aggregate and cement are pumped to the spray nozzle where water is added.
Shotcrete- wet concrete is pre-mixed before being fed to the spray head.
What is the difference between single phase and three phase?
Three phase has a larger power supply. It is more compact and less costly than a single phase.
What are the steps of the pool circulation system?
The skimmer takes water in with suction produced by the pump. The main drain is another outlet for the water to reach the pump. The water then passes through the filter to the heater. Chemicals are then dosed into the water before returning to the pool via returns.
Why is it essential to keep the water level consistent with the height of the skimmers?
It prevents air from being sucked into the skimmer. If air gets into the plumbing system, it can cause a loss in pressure and reduce the function of the circulation system.
What is the rate that pool operators should replace pool water?
30 litres pet bather.
Under what conditions do pumps operate best?
Under flooded suction conditions and be sited near the balance tank. If the plant room must be at a pool surround level, a pump pit will give flooded suction conditions.
What temperature should a pool hall be?
No more than 1 degree above that of the water.
Can multiple pools at different temperatures be operated by a single heat exchanger?
It may be possible using mixing valves and associated equipment to serve different pools at different temperatures. It is recommended that a separate heat exchanger with controls is provided for each separate pool water area- unless the pools share one filtration and circulation system.
What are the problems with higher pool temperatures?
1.Microorganisms multiply faster (up to twice as fast for a 10 degree rise) Filters are increasingly likely to become colonised. 2. Bathers get hotter limiting serious swimming and increasing sweat/grease in the water. 3. Energy costs are higher. 4. Air temperatures rise too, making surrounding atmosphere uncomfortable. 5. Dissolves gases become less soluble, so more bad smells and potentially harmful gases.
What are the recommended maximum pool water temperatures?
Competitive swimming- 28 Recreational- 29 Leisure- 30 Childrens teaching- 31 Babies, disabled- 32 Hydrotherapy- 35 Spa pools- 40
What is the guideline ventilation rate?
10 litres per second per metre squared of total pool hall. This normally results in 6 air changes per hour but may need to be increased to 8 or 10 for extensive water features. A minimum of 12 litres of fresh air per second should be ventilated for each occupant of the pool hall.
