Pool not sparkling clear, solids on bottom overnight after vacuuming.


New member
Jul 1, 2018
Began using the TFP method last year, and it has been a life changer for us. I now religiously test and treat the pool to ensure I keep it balanced, and it has been wonderful. However, I've been struggling for a couple of weeks with a slightly cloudy pool. It's almost clear but not sparkling like it has been since switching to this method. We also get an accumulation of a light rust colored solid after one night. We can vacuum it one day only to have it accumulate again the next day. IMG_1942.jpgI've attached a pic of what it appeared like today after vacuuming yesterday. It is a very fine solid, dispersing with the slightest touch. We are being careful and slow when vacuuming to try to reduce dispersing. We have a few pine trees that drop some straw, but they haven't been dropping much lately.
Here are my measurements from today before vacuuming, with some care details as well:
CYA: 50 --I try to target 40, so a bit higher than I want.
FC: 8 --Targeting 6-8 and have let it get no lower than 5 or so in the last several weeks.
CC: 0
pH: 7.8--on the high end, added Muriatic today to bump it down.
Pool Essentials 10% bleach (WalMart)
I run my pump about 8 hours per day.
I typically add the bleach in the afternoon, ensuring at least 30 minutes before allowing pump to go off.
Replaced filter sand last year.
I shocked last week, even though my numbers didn't indicate the need, but I didn't measure it every few hours after. I shocked today and am going to stay on top of it until tonight.
Is it possible that these solids are some sort of algae? I would appreciate any help anyone can offer.


Gold Supporter
LifeTime Supporter
Jul 16, 2010
Portland, Oregon
Why don't you do an Overnight Chlorine Loss Test tonight and see if you lose FC?

TFP methods don't include "shocking" the pool as you're describing. You may wish to review the SLAM Process and adjust your methods accordingly.

It looks like it could surely be algae, especially since it poofs when you disturb it. Probably should plan to SLAM.


New member
Jul 1, 2018
I adjusted the FC to my shock level (20 ppm) yesterday afternoon and ensured it was there at dusk. This morning it was 17, so lost 3 ppm overnight. Brought back up to 20 this morning and will continue SLAM until overnight loss is 1 or less.


Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
In The Industry
Apr 1, 2007
Sebring, Florida
Welcome to the forum:wave:
That's dead algae on the floor of your pool. Following the SLAM Process will get rid of it IF IF IF you follow the process correctly with brushing, filtering (run pump 24/7) and keeping your FC at SLAM value throughout the process. Don't overlook a single word of the SLAM article.