Green pool


New member
Apr 29, 2017
Valley Springs/Ca
Pool Size
Liquid Chlorine
Hello! I’m new to TFP but have been reading your forums for years. I maintain my pool myself and have had great luck with minimal effort in years past, but am struggling this year with a consistent green pool. I’ve purchased my Taylor kit and am awaiting delivery, but in the meantime received a pass from the local pool store regarding chem balance. Judging by the photo, does this appear to be algae? It’s been at shock level for weeks and it usually doesn’t take but a few days to turn blue. CYA is around 70 (per the strips and pool store). Just purchased new cartridge filters and running 24/7 for weeks now. Any advice in the interim? 5C857763-F9FD-4BA2-9D19-2A673675777E.jpeg

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
It might be algae, but that's an interesting clear hue of color. By any chance are you on a well? If not, have you used copper-based pool products in the past like algaecides, mineral packs, or products with the word "Blue" in them? Is there any staining around the pool ? How do you chlorinate on a daily basis. Also, don't forget to update your signature with all of your pool and equipment info. It will help us later.


Well-known member
May 19, 2019
Rockingham, NC
By at shock level do you mean you followed the slam process? What are you using to test your FC levels ? I had this problem last year and I just had to follow the slam process . Don’t skip steps. Thanks


Gold Supporter
TFP Guide
Jun 8, 2019
Milwaukee, WI
Pool Size
Liquid Chlorine
More importantly - you can't really do a SLAM without doing your own testing because without knowing your CYA levels it's a crapshoot, and you can't reliably measure FC over a certain level with anything but the FAS/DPD tests.

Texas Splash's question about metals is a good one, but other than that you need to get your test kit in so you can properly SLAM. Until then just add 5ppm of FC per day via liquid chlorine to try and keep it from getting worse until the text kit is in.
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