Pool With Debris on Bottom

kpbr2f

Member
Jun 19, 2019
13
St. Louis, MO
I keep getting debris build up on the bottom of the pool. Here is the scenario - Pool is clean then I run the pump. After a few hours I'll start noticing some debris on the bottom. I'll clean the pool with my robot and/or my manual vac then by the next day more debris on the bottom. Here are a few pics of the debris on the bottom of the pool. Any ideas on what this could be? And what I could do about it?
 

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kimkats

Mod Squad
LifeTime Supporter
Jul 10, 2012
45,425
Tallahassee, FL
How are you testing your water? What was the results of the last tests?

Your water looks nice and clear! Is it in a place you could suck it up with a turkey baster? If so you can do that then squirt it out on to a white paper towel in a strainer and let it dry so we can see what it looks like dry.

Kim:kim:
 

kpbr2f

Member
Jun 19, 2019
13
St. Louis, MO
How are you testing your water? What was the results of the last tests?

Your water looks nice and clear! Is it in a place you could suck it up with a turkey baster? If so you can do that then squirt it out on to a white paper towel in a strainer and let it dry so we can see what it looks like dry.

Kim:kim:
I'm using the TF100 kit. Last results from yesterday:
FC - 5.5
CC - .5
PH - 7.5
AK - 100
CH - 200
CYA - 40

I dont think its a chemistry problem. The debris isn't something that builds up over a few days. After cleaning it appears fairly quickly so I was thinking maybe its from the filter but I am a new pool owner and dont know much about the equipment. I'll try to get a dry sample to see what it is.
 

duraleigh

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TFP Expert
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In The Industry
Apr 1, 2007
33,724
Sebring, Florida
It's dead algae. At some point, you let your FC get too low and algae began to form (you can't see it). Then when you added chlorine and killed it, it sank to the bottom. The reason you can see it now when you couldn't before is the circulating water moves it into "dead spots" on your pool floor. Can you see how it's piled up on those ridges? You can "poof" it away with a brush but the circulating pool water will move it right back into small piles or in a depression or a ridge on your pool floor.

To rid yourself of it for good, you need to do the complete SLAM process and then maintain your pool with enough chlorine to keep it away fro good.
 
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Jamie A 14

Well-known member
Aug 11, 2015
92
St Johns, MI
This happens every year to me. Last year I followed instructions here and SLAM ‘d the living heck out of my pool for extended period of time, which bleached my liner and never did take care of the problem. It’s exactly as you describe. Literally today I vacuumed, it was completely clean...I turn on the pump and within minuted debris again. I just think my filter is letting debris I have vacuumed up back into the pool. It’s super annoying but I have just come to accept it. I just know I’m not going to go super high with my chlorine again and risk ruining my liner. The joys of AG pools?
 

tstex

Silver Supporter
Aug 28, 2012
1,788
Houston, TX
Have you tried changing to another filter type, if that is the problem? On my cell I cannot see if you've listed your equipment type.

If you have an algae/chemistry problem, an OCLT would help you. Buy a light liner so if you bleach it out, you won't be able to tell ?
 

duraleigh

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In The Industry
Apr 1, 2007
33,724
Sebring, Florida
Last year I followed instructions here and SLAM ‘d the living heck out of my pool for extended period of time, which bleached my liner and never did take care of the problem.
If you followed the TFP SLAM article precisely, your chlorine would not have been high enough to bleach your liner
 

tstex

Silver Supporter
Aug 28, 2012
1,788
Houston, TX
Yes, Duraleigh is correct RE making sure your CYA/FC are properly matched per chart and pH. I was being facetious in stating to buy a lighter liner so it could not be bleached.

As stated, the proper ratios per the TFP SLAM chart, you'd be set.

When you did the SLAM, what was your CYA, pH & Max FC Level when you started?