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Apr 10, 2024

How to Change Your Swimming Pool Filter Sand: A Step-by-Step Guide

Hello, pool owners! Keeping your pool sparkling and sanitary involves regular maintenance, and one critical task is changing the sand in your pool's sand filter. Over time, the sand loses its coarseness and becomes smooth, lessening its filtration effectiveness. If you're wondering how to change the sand in your pool filter, you're in the right spot. This step-by-step guide will walk you through the process, ensuring your pool remains a clean, inviting oasis under the sun.

When to Change Your Pool Filter Sand

Typically, sand in a pool filter needs changing every 5 to 7 years. However, this can vary based on pool usage and maintenance. Signs that it's time for a change include:

  • Cloudy pool water, despite regular chemical treatment and filtration.
  • The filter cycle requires more frequent backwashing to maintain water clarity.

What You'll Need

  • Replacement filter sand (silica sand 0.45 to 0.85 mm size)
  • A shop vacuum or garden hose
  • A screwdriver and/or wrench (depending on your filter model)
  • Protective gloves and goggles
    • Pentair Side Mount MPV Deep Bed Filter 1.0m dia. 1.2m depth. 65mm MPV, 250kPa

      Step-by-Step Guide

      Step 1: Turn Off the Pool Pump

      Safety first! Ensure the pool pump is turned off at the main power source to prevent any accidents.

      Step 2: Remove the Multiport Valve

      Locate the multiport valve on the top of your sand filter. You may need to unscrew or unclamp it. Be careful with the spider gasket inside, as it's delicate and essential for proper valve operation.

      Step 3: Drain the Water

      Set your filter to "winterize" mode if available, or remove the drain plug at the bottom to let water out of the filter tank.

      Step 4: Remove Old Sand

      Once drained, use a shop vacuum to suck out the old sand, or scoop it out manually. Take care not to damage the filter's laterals at the bottom of the tank.

      Pentair PWT S series Filter 1.2m dia, 80mm MPV, 250kPa

      Step 5: Add New Sand

      Before adding new sand, check and, if necessary, replace any damaged laterals. Then, fill the tank halfway with water (to protect the laterals from the weight of the sand). Slowly pour the new sand into the tank, ensuring you do not overfill it. The exact amount of sand needed will depend on your filter size - consult your filter's manual for specifics.

      Step 6: Reassemble and Rinse

      Once filled, reattach the multiport valve (being careful not to disturb the new sand), secure it tightly, and set your filter to the "rinse" setting. Run the pump for a few minutes to settle the sand and remove any fine particles.

      Step 7: Back to Normal

      Finally, set your filter back to its normal operation setting. Your sand filter is now ready to keep your pool water clear and clean!

      Changing the sand in your pool's filter might seem daunting, but it's a manageable task for the dedicated DIY. Regular maintenance, including changing the filter sand, ensures your pool remains a healthy and enjoyable part of your home. Cheers to many more sunny days spent poolside!

      About Pool Shop

      Pool Shop is one of Australia's leading suppliers of pool and spa products, offering a wide range of essentials like cleaners, pumps, lights, chlorinators, filters, chemicals, spare parts, and more. We stock the highest quality products as authorised sellers of leading brands such as Zodiac, Astral Pool, Maytronics, Hayward, Madimack, Polaris, Pentair Onga and more. With a price match guarantee and fast delivery, we ensure a seamless shopping experience.

      Visit our shop in Unanderra near Wollongong for personalised service and expert advice or order online.

      Contact us on or call 02 9137 8914.