Filtering – Mechanical water treatment
Category : Construct
An effective filtering system solves 80 % of water-related problems encountered in pools, the remaining 20 % are due to the chemical treatment.
What is an effective filtering system?
The components of a pool filtering system are listed below in order of priority:
- Sufficient number of suction - discharge sealing parts
- An appropriate pump
- A suitable filter
- Suitable pipework
How to determine whether the components are suitable filtration rate?
To make a choice compatible with the size of the pool:
The volume of a private pool must be filtered within 4 to 6 hours:
- 5 hours on average (4 hours in hot regions)
- Filtration rate = pool volume/recycling time
Flow rate Q = Pool volume/Recycling time = V m3 / 5 hours
How to determine the volume of your pool?
Reminder: measuring units and calculation
Surface in m2
Length x width L x w = S m²
Volume in m3
Length x width x height*: L x w x h = V m3 *height = depth
π x Radius² x height: 3.14 x R² x h = V m3
Length x width x average height*: L x w x [(H1+H2)/2]
Length x width x average height L x w x [(A+H)/2]
How to calculate the required flow rate?
- The flow rate is expressed in m3/h
- This represents the quantity of water which passes through the facility within 1 hour
For a pool of 10 x 5 m with a depth of 1.50 m
- Pool Volume:
- Surface: 10 x 5 = 50m²
- Volume: 50m² x 1.50 m = 75 m3
- Filtration rate:
- 75 m3/5 hours = 15 m3/h
It is therefore necessary to choose equipment with a filtration rate of 15 m3/h
The 3 major standard components on the pool market
Pool < 4 x 8: 50 m3 = 10 m3/h
Pool < 5 x 10: 75 m3 = 15 m3/h
Pool < 6 x 12: 100 to 110 m3 = 22 m3/h
What daily filtration time is to be used?
A pool must be filtered several times a day (not only during 5 hours)
The use is required to determine the filtration time:
Water T° / 2
Water at 24°C = filtration 12h per day – during day time (greater pollution)
For a pool of 10x5 with a depth of 1.5m, a filtration rate of 15m3/h is required to entirely filter the pool in 5h.
In summer at 24 degrees, the pool must be filtered during 12h, which means filtering the entire pool twice in a day.
In addition to the suction sealing parts and the pipework, which must allow the following volumes of water to pass through, two components are essential.
- The pump
- The filter