Pool filtration systems

The pool purifier or filter

It is one of the parts in charge of maintaining the water clean and in optimal conditions for the bath. Its main function is to retain the physical dirt present in the water and return it filtered to the pool.

why choose a filtering system for swimming pools?

Prevents water from "stagnating": Filtration is essential for good water quality, as it prevents the accumulation of bacteria and contamination. A good filtration will treat 80-90% of the impurities in the pool water.

how do swimming pool filtration systems work?

Filtration works by circulating water through a filter by means of a motor. During this process, contaminating particles are retained in the filter material, while clean water is returned to the pool.

This system ensures constant water quality, considerably reducing the need for additional chemical treatments.

The filtration circuit includes: skimmer, skimmer intake, bottom, filtration pump and delivery nozzles.

how to size the filtration system?

It is based on the volume of the pool to determine the minimum filtration requirement. Basic rule: recycle the entire volume of water in about 4 hours.

Calculation: Pool volume / 4 hours = filtration flow rate (m³/h)

Example: 60 m³ pool / 4 = 15 m³/h

how to choose the equipment?

• Choose the pump: According to pressure/flow curve and pressure drop. Consult the manufacturer's pump curves.
• Choosing the filter: Depending on the selected pump.

Main characteristics of the purifiers for swimming pools

Available filter types

Sand/glass filter

• Filter media: sand or glass
• Fineness: 30-50 μm (sand), 20-30 μm (glass)
• Advantages: Economical, easy to use and clean. More durable glass.
• Disadvantages: More complex installation.
• Use: Suitable for all types of pools.

Cartridge filter

• Medium: synthetic fiber cartridge
• Fineness: 10-30 μm
• Advantages: Easy to install, low water consumption.
• Disadvantages: Expensive cartridges. Frequent cleaning required.

Diatomaceous earth filter

• Medium: fossilized algae powder
• Fineness: 5-10 μm
• Advantages: Excellent fineness, no flocculant needed.
• Disadvantages: High cost, more complex use.

Other outstanding features

• Filtration capacity: From compact to powerful models.
• Energy efficiency: Low consumption pumps.
• Technological innovations: Self-cleaning, automatic backwash, intelligent control.
• Pump/filter combination: Essential for optimum hydraulic performance.

how long to filter?

• Depends on temperature, dirt and frequency of use.
• Start of season: 1 recycle/day.
• Summer: 2 recycles/day.
• Rule of thumb: Water temperature / 2 = hours of daily filtering.
• Recommendation: change 1/3 of the water every year.

Special case: variable speed pump

Lower speed, but prolonged filtration.

Example: Pump 1500 RPM → 8 m³/h → 60 / 8 = 7.5 h → x2 = 15 h/day.

Key technical concepts explained

• Filtration capacity: Water processed per hour.
• Cleaning: Backwashing to remove debris from the filter.
• Filter material: Sand, glass, cartridge, diatomaceous earth.
• Filtration rate: m³/h/m². Too high = inefficient filtration. Too low = insufficient.

Filtration and variable speed pumps

Revolutionize the system by allowing more efficient flow control.

Benefits

• Energy savings of up to 80%
• More efficient filtration
• Longer equipment life
• Reduced noise
• Adaptability and intelligent programming