Could this be algae or dirt/pollen?

[waterbear]

It is hard to tell from the picture but it looks like it could be mustard algae. You need an accurate set of test results so we can help you with it if it is mustard algae. Especially an accurate CYA reading since that will determine just how high you need to go with your shock levels to kill it.

[ShelleyAnn]

DO NOT trust the pool store to give you accurate readings ESPECIALLY CYA

[ChuckD]

Also, keep your filter running; you mentioned you turned it off.

C.

[waterbear]

DO NOT trust the pool store to give you accurate readings ESPECIALLY CYA

This really depends on the store and who is doing the testing. Let's be fair now. I am the first one to say that many pool store employees who test water are clueless but there ARE a few of us good ones out there!

[itstoohot]

OK, back from the pool store. Here we go:

PH - 7.8
FC - 6+
TC - 6+
TA - 140
CYA - 80
Copper - .06

Pool temp is about 78F

I sampled the stuff and pool store says its algae. They are also a little confused that I still get chlorine readings with this stuff in the pool. They had me purchase Green Treat by United Chemical. I haven't put it in yet. It is sodium bromide based (48.5%).

Thanks for all your help!

[CarlD]

DON'T USE THAT STUFF!!!!! YOU'll SPEND WEEKS ADDING TONS OF CHLORINE TO GET IT OUT!!!!!!! THE CURE IS WORSE BY FAR THAN THE DISEASE!!!!

It's only for desperation situations--which you do NOT have!

Nowhere have I seen that you VACUUMED your pool. Do so and see if it goes away and returns. I get all kinds of similar looking stuff on the bottom of my pool from pollen and dust and it just vacuums up and the pool chemistry is FINE. It looks a lot like that but it's definitely NOT algae--it is brown but not a problem.

[itstoohot]

I have tried to vaccuum and found it returning through the jets. I pulled the filters out to clean them, assuming they were at capacity, and found them to be rather clean except for a yellowish-greenish hue to the water running out of the cartridges. I have not tried vaccuuming since I put in the clean cartridges.

[CAP]

Vacuum to waste.

[itstoohot]

I have a cartridge filter (Hayward SwimClear). How do I vacuum to waste?

[swimmy]

I am having a similar problem. I have shocked the pool and it stays free of yellowish brown powder which collects in the same spots of the liner each time until I turn on the filtration. (It poofs when swept and vaccuums easily). I have shocked and treated with yellow rid. The pool water is perfectly clear and the pool floor will stay clear for days UNTIL I turn the filtration system on. I too believe it is coming from jets. I have backwashed and rinsed and poured in the recommended amt. of filter cleaner. Could the filter sand need to be changed. If this residue is in the pipes how do I push it out?