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OK, I tried the c tablets and they didn't appear to have much effect. BUT, while I was down there I noticed that it seems like the algae is spreading for the first time in a while. I quickly checked FC and CYA and found them to be 21 and 65 respectively. Then it hit me... it rained a lot...

Can the Vit C have rose hips?

Builder confirmed there is no abalone shell in the plaster mix.

Not sure. Contract just said interior finish would be Quartz - Sky Blue. I can say that areas where I've manually cleared the black dots are back to the original look, and that these black dots do spread and grow with time, so I wouldn't think they're part of the plaster mix. I've also had...

Have a look. If it's something else, please let me know. One picture shows a stair step from September. The largest spot has been cracked or crushed by me, which sometimes "outgasses" some black residue. The second picture is from this past week, different location on the stairs. I've been...

Yes, I've had trouble finding anyone else with this condition. Is the recommended course to just continue with the elevated FC and scrubbing? I'll do a partial water change to get the CYA down, but can I do anything else? I'm getting desperate.

I recall your recommendation, but I was hoping if you followed the calculator and just simply took the FC even higher to match that it would have the same net effect. As for the black algae, it took root about 7-10 days after water was added to the pool (brand new). I'll cut the CYA down and...

Yes, the pool runs 24/7 now, FC has been in the 17-26ppm this week and I still have not seen much progress with the black algae. I have focused on a particular "test" area, and scrubbed that spot day after day, 2-3 a day, with wire brush and nylon and the black algae spots still do not come up...

Hi All, thank you again for the continued advice. It really helps. I am now at nearly 2 weeks in elevated FC levels. I have kept the FC within about 22-26, which is just under SLAM for the CYA. The pH has improved, but still work to be done to keep it stable in the 7.4 range. The BA seems...

A quick update. I've gotten and held the FC in the low 20s now. 20-24 ppm. I am scrubbing twice a day. I do believe progress is happening, but its slow. Some of the black spots are turning a reddish brown, which in my experience is when the algae shell has come off and it is being killed by...

I ran the test this morning and got 110-120 ppm TA. I put a range because at 11 drops it just faintly started turning some areas red but wouldn't hold and at 12 drops it went full solid red. So seems in line with the 125 from the store. Acid has been added since the 125 reading, so I think...

I haven't tested recently, but pool store test from 2 days ago was 125ppm.

Oh, wow. I've read in a few places that adding chlorine drives pH up, but if this is the case, how should I test pH? Or what should I do to ensure it's not too high?

Thank you both. I got the pH levels down into the mid-7s and started to ramp up the run % on the chlorine generator, also switching it to run 24/7. Today, pH was back up to 8.0 with an acid demand of 2 quarts and FC had risen from 8 to 11. From what I understand, the more chlorine I generate...

Hi All, thanks for your input and feedback. I was basing my plan off the BA article here on TFP: https://www.troublefreepool.com/blog/2019/01/18/black-algae/?gclid=Cj0KCQjw8qmhBhClARIsANAtbodJBSpRxA3UK_RCHH-R6nPvPydMdhAnRdk8I_npAKtD0MchffYIxpIaAiY_EALw_wcB In the article, it says to keep FC...

Hi All, As mentioned in my intro, I have a black algae problem. It's the reason I'm here. After months of reading and hearing different things to try, this is my last resort. Fingers crossed. Background: The pool was built over the first 9 months of 2022. It was officially filled with water...

Hi Everyone! My name is Mike, I am from Orlando, FL. I recently moved back to the area from Miami. In Miami, I had a pool, but it was about 15 years old and well established, never had any issues with algae or water problems. All my issues in Miami were related to plumbing leaks and old...

Hello, I'm slightly confused by this. I thought SWP's ideal range of CYA was 60-90, no? Are you lowering just for this algae situation? Also, I have read through several of the articles on this page, but can't find a direct explanation for why SWPs require more CYA than conventional chlorine...