I started off with a previous post thinking I had DE at the bottom of my pool. Now I don't believe it was.
www.troublefreepool.com
Folks in here suggested mustard algae, as did the guys who built my pool. I did both the SLAM process and the algaecide method ( I know, go ahead and yell). The suspected "algae" never turned brown as it was supposed to. Nevertheless, I vacuumed to waste and then used the robot. I still go out every day and see collections of this dirt in great quantities trapped in corners and wrinkles. Today after my robot picked it up, I did a bit more analysis. Attached is a picture. It's the consistency of beach sand (coarse).Shown is several ounces in a coffee cup.
The fatalist in me is now suspecting an underground pipe leak letting this material in. I'm contemplating having someone run a camera down the pipes.
Pool is crystal clear (never cloudy) and the residue just sits on the bottom. I don't see anything too coarse in the skimmer or skimmer socks. Here's some chemistry from today for the record.:
FC- 4
TC- 4
CC- 0
pH- 8.1
Hardness- 163
Alkalinity- 104
CYA- 33
Copper- .4 (Dang algaecide, lesson learned)
Phosphates- 1230
Salt- 3300

Pentair Quad DE 60 leaking
This year’s opening started off with a bang. The liner fell due to a warm winter, which I fixed, but there’s wrinkles at the bottom that are fairly severe I still have to attend to. Also, it appears that DE is seeping back into my pool. I’ve tightened up everything and I don’t see what’s...

Folks in here suggested mustard algae, as did the guys who built my pool. I did both the SLAM process and the algaecide method ( I know, go ahead and yell). The suspected "algae" never turned brown as it was supposed to. Nevertheless, I vacuumed to waste and then used the robot. I still go out every day and see collections of this dirt in great quantities trapped in corners and wrinkles. Today after my robot picked it up, I did a bit more analysis. Attached is a picture. It's the consistency of beach sand (coarse).Shown is several ounces in a coffee cup.
The fatalist in me is now suspecting an underground pipe leak letting this material in. I'm contemplating having someone run a camera down the pipes.
Pool is crystal clear (never cloudy) and the residue just sits on the bottom. I don't see anything too coarse in the skimmer or skimmer socks. Here's some chemistry from today for the record.:
FC- 4
TC- 4
CC- 0
pH- 8.1
Hardness- 163
Alkalinity- 104
CYA- 33
Copper- .4 (Dang algaecide, lesson learned)
Phosphates- 1230
Salt- 3300
