Cloudy Pool Water & Algaecide..Need Help
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I live in CT and just opened my 23k gallon in ground pool 2 days ago. I added 2 gallons of liquid shock and then a quart of algaecide.
Tried strips & liquid test kits and one showed pH low and the other showed pH high? There is some greyish staining on the vinyl liner around the main drain in the deep end that won't come off?!? I added some pH raiser and more algaecide & now the water is cloudy and there some kind of foam floating on top.
I have a DE filter which the pressure looks good on. I did backwash it numerous times just in case. What do you think/recommend?
With a 23k gallon pool be sure your hitting the super-chlorination level. Without that you can't kill any of the algae, bacteria, or foreign matter in the pool. I have 2 good pages on chlorine. This one is a good starting point:
Adjust Your Swimming Pool Chlorine
As the for algaecide, be sure it's of high quality. This could be causing your foaming issue. Normally there are four reasons why pools foam up: Soap- Rinse toys and swimsuits before allowing them in the pool.
Algaecides- Inexpensive "...alkyl-dimethyl..." type algaecides will foam. Use a non-foaming "poly" type. Also, avoid copper algaecides to avoid the green hair. A foaming algaecide in the pool should break down and go away.
If you can see algae it has already been growing in the water for a while. This can foam if the water is churned up (aerated). Use a good dose of chlorine shock as this should burn-off the organic matter.
Air leaks- Be sure the pump motor and plumbing are working and you have enough water in the pump. If the pot is drawing in air you might have an air leak in the plumbing somewhere.
For your test strips and liquid test kit I always highly recommend a FAS-DPD Taylor Reagent K 2005 or 2006 test kit, not the yellow test kits.
Water Testing Kit
It's what I use at the YMCA, for my customers, and what the Oregon state health board uses when they come and test the water. This kit will give you the most accurate reading.
For the greyish stain by the main drain it could be stubborn algae. Be sure to super-chlorinate your pool properly.
Brush any residual algae that you can. Test your chlorine level after the shock to be sure to have gotten to the super-chlorination level.
Be sure your DE filter is in good order and has no tears or rips. Also re-coat the grids each time you backwash. the cloudy water should clear up if everything is working properly.
DE Pool Filters
Hope this helps and let me know if there's anything else I can do