Comments for Swimming Pool Sand Filter..Pool Seems To Be Manufacturing Small Debris

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Oct 09, 2011
Still have debris
by: John M

The end of summer and the pool is closed - but the problem has still not been solved. I contacted Hayward and received an email back within a day or two. They suggested that I add some diatomacious earth to the sand filter to filter out the small particles. Then, at my urging, got them to admit it could be a problem with the slector valve. I ordered a replacement valve seal (which is half of the valve and cost $42). Replaced it, checking for any cracked or broken parts when I disassembled it. Put it all back together and - you guessed it - no change in the symptoms. I am seriously considering buying a new filter before next season. This is only my third filter for my pool, and we have had a pool for 27 years now. This is the first real "unsolvable" problem I have had.

The problem is not a filtration problem. The filter works fine and the water is always clear. The filter just seems to release some debris back into the pool when the pump is restarted after being shut off for a period of time, even if I have properly backwashed and rinsed the filter.

Jun 24, 2012
Finally found the answer
by: John M

After much deliberation, a lot of frustration, and almost two pool seasons dealing with this issue, I found the answer today.

I have a 1982 Mercedes 300D that burns regular diesel fuel, bio-diesel, or straight vegetable oil. While cleaning my waste vegetable oil, I have been using gravity feed "filter bags" to filter the impurities out of the vegetable oil for about three years. I got the idea to try filtering the pool water through a 1-micron bag filter and see what happened.

I bought a 90 degree fitting and attached it to the return fitting going into the pool from the filter and attached the 1-micron filter bag to it with a stainless steel clamp. I turned on the pump and have let it run for 8 hours now, and there is no debris entering the pool. It appears (to me), there were many particles in the pool water and filter that the sand filter was not fine enough to trap.

The 1-micron filter will trap just about anything that a person could ever see. I'm going to run the pump and filter with the 1-micron filter for 24 hours and then disconnect the 1- micron filter. My guess is that there will be no debris entering the pool. My hint? The 1-micron bag filter is showing heavy coloration from the debris it is catching, and no debris is entering the pool.

Problem solved? Not entirely.

I'm not sure where this microscopic debris came from, but once it entered the pool and the filter, it just kept cycling through the filter. I will come back and post again after a few days of running "normally" without the 1-micron filter.

What a pain in the _ _ _.

Jun 16, 2014
1 Micron Filter
by: Karen

Did the 1-micron filter work? If yes, where can I find one? I have been dealing with the same issue for 3 fed up!

Aug 23, 2014
Debris in pool
by: Andrew

I have the same problem with debris. Changed filter and new glass media but still debris.
How did you attach the 1 micron filter to the pool outlet.?
This is the best answer I have read so far and like you I have thought of everything including broken pipes.
Appreciate your help,

May 10, 2015
Cloudy Return While Cleaning
by: Mike

Checked laterals, changed sand, always rinse after backwash, changed head or top on filter. Next day sediment gathers on creases. Hayward filter seems to fail and I am always cleaning which only occurred half way through last season and starting again this season. It is very frustrating after 16 years of effortless cleaning in past years. Dealer indicated that pollen might be the problem and recommended shock but to no avail the problem continues. Very frustrated

Thanks for the question Mike

If you've recently changed the sand, within the last couple of weeks, the new sand will go into the pool and you'll vacuum it up until the sand inside the tank settles.

Next is to be sure of the freeboard. This is the measurement from the top of the sand to the top of the filter. Check with your owner's manual for the correct measurement.

If all of that is good, the laterals are new, and the Multiport Valve is good along with the spider gasket, then then next step is having your chemical readings, the actual numbers:

Chlorine, CYA (cyanuric acid/stabilizer), pH, Alkalinity, Calcium Hardness, and Metals (iron and copper) and names of any algaecides you may have used along with clarifiers, phosphate removers, and/or flocs. It makes troubleshooting much easier and the process of clearing up your pool will go much faster.

If you feel your situation is more complex than this, I do phone consultations. It makes things go much faster and many people have found it extremely beneficial, saving them time and money in the long run. All your questions will be answered. I have nothing to sell you so you know I'm not bias.

Pool Consultation

Hope this helps and have a great Summer.


Jun 28, 2015
Fine debris
by: Andy

Hi there. I have resolved a similar problem. I have a vinyl liner inground, indoor pool. The liner sits in a concrete (sand and cement) 'hole in the ground'. My problem was water behind the liner. How did it get there? Skimmer aperture leaks. It appeared the screws had been over tightened, and the pastic had distorted behind the rubber gasket. Not visible at all unless it was dismantled. While the pump was off, the water seeped into the liner behind the gasket, dissolving the cement. Then when the pump was on, it gradually pulled this water into the system. The debris was very fine. When I filtered the water with a felt cloth, the residue looked exactly like grey cement. There was no noticeable water loss. I should have realised the problem when I started noticing the pool wall getting 'lumpy' around and below the skimmer. I also have quite a lumpy pool bottom in areas too- maybe the water has sunk right to the bottom. Anyway, after sealing the skimmer aperture, I no longer have ANY of the debris. Interestingly it was pretty much evenly distributed on the pool bottom. I find sand returning from the filter collects near the outlets. Hope this information might help anyone,

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