Hints & Tips - Purchasing Guide
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Industry accepted standards for water quality in swimming pools recommend that filtration equipment is able to turn over the entire body of water within these time periods.
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Actual operating time per day is dependant on debris load, number of bathers and sanitation
method. |
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Davey has made product selection easy by labelling their equipment with flow rates for
average operating pressures, and converted these with domestic swimming pools turnover
rates into a simple table.
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To select the right equipment for your pool, follow steps 1,2,3 and 4
1. Calculate your pool volume.
Calculate your pool volume.
The formulae below requires all dimensions to be
in metres. If the depth of the pool varies, the
average depth should be used.
RECTANGULAR POOLS
length x width x depth x 1000 = volume in litres
ROUND POOLS
diameter x diameter x depth x 785.5 = volume in
litres.
Rectangular above ground pools.
4.9m x 3.7m x 1.2m = 22 000 litres
(16' x 12' x 4')
6m x 3.7m x 1.2m = 27 000 litres
(20' x 12' x 4')
7.3m x 3.7m x 1.2m = 32 000 litres
(24' x 12' x 4')
9.8m x 3.7m x 1.2m = 44 000 litres
(32' x 12' x 4')
5.8m x 4.5m x 1.2m = 31 000 litres
(19' x 15' x 4'
8.2m x 4.5m x 1.2m = 44 000 litres
(27' x 15' x 4')
9m x 4.5m x 1.2m = 49 000 litres
(30' x 15' x 4')
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Circular above ground pools
3.7m x 0.9m = 10 000 litres
(12'x3')
4.5m x 0.9m = 14 000 litres
(15'x 3')
4.5m x 1.2m = 19 000 litres
(15' x 4' )
5.5m x 1.2m = 29 000 litres
(18' x 4')
6m x 1.2m = 34 000 litres
(20' x 4')
6.7m x 1.2m = 42 000 litres
(22' x 4')
Rectangular in-ground pools.
6m x 3.7m x 1.4m = 31 000 litres
(20' x 12' x 4'6")
7.3m x 3.7m x 1.4m = 38 000 litres
(24' x 12' x 4'6")
9m x 3.7m x 1.4m = 47 000 litres
(30' x 12 x 4'6')
9m x 4.5m x 1.4m = 57 000 litres
(30' x 15 x 4'6")
12m x 4.5m x 1.4m = 76 000 litres
(40' x 15' x 4'6")
12m x 6m x 1.4m = 101 000 litres
(40' x 20' x 4'6")
15m x 7.5m x 1.4m = 158 000 litres
(50' x 25' x 4'6)
1.4m (4'6") = average depth
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2. Selecting the right size pump or filter
In ground swimming pools
| Pool Volume |
Power Ace CR Pumps |
Power Master Pumps |
Crystal Clear Sand Filters |
Easy Clear Cartridge Filters |
| 30 000 l |
PA CR 100 |
- |
CC180 |
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| 45 000 l |
PA CR 150 |
- |
CC 180 |
EC 500 |
| 70 000 l |
PA CR 200 |
PM 200 |
CC240 |
EC 700 |
| 90 000 l |
PA CR 300 |
PM 250 |
CC330 |
EC 1000 |
| 110 000 l |
PA CR 300 |
PM 350 |
CC 400 |
EC 1500 |
| 160 000 l |
- |
PM 450 |
- |
EC 1500 |
Note: It is possible to use larger sized cartridge filters to minimise the element cleaning required.
Above ground swimming pools
| Pool Volume |
Power Ace CR Pumps |
Power Master Pumps |
Crystal Clear Sand Filters |
Easy Clear Cartridge Filters |
| 40 000 l |
PA CR 100 |
PM 100 |
CC 180 |
EC 500 |
| 50 000 l |
PA CR 150 |
PM 150 |
CC 180 |
EC 750 |
3. Selecting the right filter type
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Sand Filter |
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Cartridge Filter |
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Sand |
Zelbrite |
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| Filtration Clarity |
good |
excellent |
very good |
| Smallest particle removal |
15-20 |
3-5 |
5-10 |
| Media Type |
granular media which is re-used for several years |
granular media which is re-used for several years |
Mesh element which is regularly cleaned and replaced after 3-5 years |
| Cleaning method |
Backwash - reverse flow of water through filter to flush out dirt |
Backwash - reverse flow of water through filter to flush out dirt |
Remove element and hose down. Acid wash once a year. |
| Loss of pool water |
Yes, due to backwashing |
Yes, due to backwashing |
No, as backwashing ************ |
| Ease of operation |
Very simple, as the media is not handled and is re-usable |
Very simple, as the media is not handled and is re-usable |
Requires more attention as the element should be removed and ***** |
| Operating cost |
Low, as media is virtually permanent |
Low, as media is virtually permanent |
High, as elements are relatively ******** |
| Initial cost |
Medium |
Medium |
Low |
Difference Between Filters
Sand filter with Sand - 20-15 micron
Cartridge filter - 7 micron
Sand filter with Zeolite - 1 micron
D.E. filter - 5 micron
*THE DIFFERENCE BETWEEN FILTERS*
The difference between sand and cartridge filters is basically a choice between water saving, and water clarity.
For example; 1 micron being the clearest water.
Sand Filter with Sand media :15-20 micron
Cartridge Filter: 7- 10 micron
D.E Filter: 5- 7 micron
Sand Filter with Zeolite media - 3 micron
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Basically, you have 2 choices in Filtration.
A) Water Clarity & B) Water Saving
A) WATER SAVING FILTRATION
FILTER CARTRIDGE - DAVEY EC SERIES
CARTRIDGE - DAVEY SILENSOR SERIES( SUPERQUIET)
SALT WATER CHLORINATOR - DAVEY SC SERIES (DIGITAL SELF CLEAN)
POOL BLANKET & ROLLER - (50% SAVING ON WATER EVAPORATION)
B) WATER CLARITY FILTER
FILTER CARTRIDGE - DAVEY CC SERIES (SAND FILTER)
CARTRIDGE - DAVEY SILENSOR SERIES( SUPERQUIET)
SALT CHLORINATOR - DAVEY SC SERIES (DIGITAL SELF CLEAN)
ZEOLITE - MINERAL FILTER MEDIA (POROUS 1 MICRON)
NATURE 2- MINERAL DISPENSOR (REDUCES CHLORINE)
POOL BLANKET & ROLLER - (50% SAVING ON WATER EVAPORATION)
Recommended Chemicals For Pristine Water Clarity
# Super shine
# Gel cube
# Starver
# Clarifier
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4. Selecting the Right Sized Chlorinator
The appropriate chlorinator size for your pool is dependent on the local climate and the amount of use the pool gets. Note that chlorinator cell life can be increased with shorter running times during winter and lower output settings. Davey recommends that a chlorinator is run for between 6-8 hours a day during summer and between 2-4 hours during winter. A 24 hour super-chlorination after heavy use is also a good idea.
Maximum pool volume for chlorinators
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