How to Clean Sand in a Pool Filter (Deep Cleaning Guide)

Over time, the sand in your pool filter can become clogged with oils, debris, and buildup that regular backwashing cannot remove. A deep cleaning helps restore proper filtration, improve water clarity, and extend the life of your sand.

When Should You Clean Your Sand?

• Filter pressure stays high after backwashing
• Water remains cloudy
• You need to backwash more often than usual
• Sand may be coated with oils, sunscreen, or debris

Method 1: Backwash Cleaning (Quick Maintenance)

This is your regular cleaning method and should be done whenever pressure rises.

1. Turn off the pump
2. Set valve to Backwash
3. Turn pump on and run for 2–3 minutes (until water runs clear)
4. Turn off pump
5. Set valve to Rinse for 30–60 seconds
6. Return valve to Filter
7. Restart system

If this does not resolve your issue, a deeper cleaning is recommended.

Method 2: Deep Cleaning with Sand Filter Cleaner

For best results, use a sand filter cleaner to break down oils and buildup that backwashing cannot remove.

We recommend using Doheny’s Sand Filter Cleaner for an effective deep clean.

Step-by-Step Deep Cleaning

1. Backwash the filter first to remove loose debris
2. Turn off the pump
3. Set valve to Filter
4. Remove pump lid or access point (if needed)
5. Pour the recommended amount of cleaner into the skimmer
6. Run pump briefly (1–2 minutes) to distribute cleaner into the sand
7. Turn off pump and let the cleaner sit for 8–12 hours (overnight is best)
8. Backwash thoroughly the next day to flush out debris and cleaner
9. Rinse and return to normal filter operation

Signs Your Sand Needs Replacement Instead

• Sand is older than 5 years
• Water remains cloudy after cleaning
• Sand feels clumpy, greasy, or hardened
• Filter performance does not improve after deep cleaning

Common Questions

• Can I clean sand instead of replacing it?
• How often should I deep clean my sand filter?
• Why is my filter pressure still high after backwashing?
• What does sand filter cleaner do?

Contact Doheny's Customer Care

If you need help, our Customer Care team is here to assist.

📧 Email: customercare@doheny.com
📞 Phone: 800.574.7665
💬 Live Chat: www.doheny.com
📩 Contact Us: www.doheny.com/contact