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.
Important: Always turn off your pump before adjusting valves or opening your filter system.
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
Helpful Tip: Sand typically lasts 3–5 years, but deep cleaning can restore performance and delay replacement.
Method 1: Backwash Cleaning (Quick Maintenance)
This is your regular cleaning method and should be done whenever pressure rises.
- Turn off the pump
- Set valve to Backwash
- Turn pump on and run for 2–3 minutes (until water runs clear)
- Turn off pump
- Set valve to Rinse for 30–60 seconds
- Return valve to Filter
- 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
- Backwash the filter first to remove loose debris
- Turn off the pump
- Set valve to Filter
- Remove pump lid or access point (if needed)
- Pour the recommended amount of cleaner into the skimmer
- Run pump briefly (1–2 minutes) to distribute cleaner into the sand
- Turn off pump and let the cleaner sit for 8–12 hours (overnight is best)
- Backwash thoroughly the next day to flush out debris and cleaner
- Rinse and return to normal filter operation
Helpful Tip: Deep cleaning once per season helps maintain strong filtration and reduces the need for frequent backwashing.
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
Note: Cleaning helps restore performance, but it cannot fix worn or damaged sand.
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
We're Here to Help: Doheny’s has been helping pool owners since 1967. Our team is happy to assist with filter care, maintenance, and troubleshooting.