filter maintenance

filter maintenance

Pool filter maintenance is a crucial aspect of keeping your swimming pool clean and safe. Properly maintaining your pool filter ensures that it effectively removes dirt, debris, bacteria and contaminants from the water, which helps maintain water clarity and overall hygiene. There are three main types of pool filters: sand, cartridge, and diatomaceous earth (DE)—and each requires specific maintenance procedures. Here’s a detailed guide on how to maintain each type:

1. Sand Filters

Sand filters are one of the most common types of pool filters. They work by passing pool water through a bed of sand that traps particles and debris. With out proper maintenance bacteria and bio film build up can lead to a loss in efficiency and difficulty keeping the water clean, safe and sparkling. 

Maintenance Steps:

  • Backwashing: When the pressure gauge on the filter rises 8-10 psi above the normal operating level, it's time to backwash. This process reverses the water flow to fluidise the bed and flush out dirt and debris trapped in the sand.
    • Steps: Turn off the pump, set the filter valve to “backwash,” and restart the pump. Run it until the water in the sight glass is clear (usually 2-3 minutes). Turn off the pump, set the valve to “rinse,” and run the pump for 45 seconds before setting it back to the “filter” position.
  • Sand Replacement: Over time, the silica sand becomes less effective at trapping particles. Replace the sand every 5-7 years, depending on usage.
    • Steps: Drain the filter, remove the old sand, and refill with the appropriate grade and amount of pool filter sand.

2. Cartridge Filters

Cartridge filters use pleated fabric to trap debris and contaminants. They are known for their efficiency and are easier to maintain compared to sand filters.

Maintenance Steps:

  • Cleaning the Cartridge: When the pressure gauge indicates a rise of 8-10 psi, or about every 4-6 weeks during the swimming season, the cartridge needs cleaning.

    • Steps: Turn off the pump, open the filter housing, and remove the cartridge. Hose it down thoroughly, focusing on each pleat. For a deeper clean, soak the cartridge in a solution of water and filter cleaner for several hours, then rinse it off. If using filter cleaner ensure the filer is allowed to dry fully before use. We recommend having two or more in rotation. 
  • Replacement: Cartridges typically last 2-3 years, but this can vary based on the pool usage and water quality. In Hot Tubs the life span is considerably reduced.

    • Steps: Replace the cartridge when it shows signs of wear, such as tears in the fabric or flattened pleats.

3. Diatomaceous Earth (DE) Filters

DE filters offer the highest level of filtration, trapping particles as small as 2-5 microns. They use a powder made from fossilized diatoms to coat grids inside the filter.

Maintenance Steps:

  • Backwashing: Similar to sand filters, DE filters need backwashing when the pressure gauge shows a rise of 8-10 psi.

    • Steps: Backwash the filter by setting the valve to “backwash” and running the pump until the water runs clear. After backwashing, you need to add new DE powder to the filter.
  • Adding DE Powder: After backwashing, the DE powder coating on the filter grids needs to be replenished.

    • Steps: Mix the required amount of DE powder (check the filter’s manual) with water in a bucket, then pour the mixture into the skimmer while the pump is running.
  • Deep Cleaning: At least once a year, disassemble the filter and clean the grids thoroughly.

    • Steps: Remove the filter grids, hose them down, and soak them in a filter cleaner solution. Rinse well before reassembling.
  • Grid Replacement: The filter grids should be replaced every 5-10 years or sooner if there is noticeable wear, tears, or damage.

General Pool Filter Maintenance Tips:

  • Regular Monitoring: Check the pressure gauge regularly. A sudden rise indicates the filter is dirty and needs maintenance.
  • Water Chemistry: Properly balanced water chemistry helps extend the life of your filter. High levels of calcium or improper pH can lead to scale buildup or damage.
  • Leak Inspection: Regularly inspect the filter and its connections for leaks or cracks, as these can reduce filter efficiency and lead to water loss.
  • Winterization: If you live in a region where temperatures drop significantly, ensure your filter is properly winterized to prevent freezing damage. This may include draining the filter and storing it if necessary.

Proper maintenance of your pool filter not only extends its life but also ensures your pool water remains clean and safe for swimming. If you have any questions please email info@surreydreampools.co.uk or call 01428 735044. We are happy to help.

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