Black Spot Algae

[bobodaclown]

Hello All,
Posting for a friend.
They have black spot algae. Pool is Diamond Brite (Concrete).
Numbers are PH 7.2, FC 5, CC .5, TA 140, CH 750, CYA 40. 17K pool.

They use 10% liquid chlorine, she normally pours 2.5 gallons in once a week. I've recommended that she adds 3 times a week 1 gallon each time. I've recommened she bring it to shock level (15), maintain it there and brush using a stainless steel brush to expose the algae. I showed them pool calculator, got the total she needs to bring it up to 15 for shocking and try to maintain it.

Pool also has what appears to be calcium deposits on the sides, brushing with the SS brush releases it into the water.

Any suggestions.

Thanks in advance.
Bobo

 

[PoolGuyNJ]

After the BA is solved, she'll need to dilute. The calcium level should be 1/2 that.

Scott

 

[duraleigh]

I have to post this every time I see "for a friend (or relative)".

Very difficult to fix someone else's pool when they are not interested enough to come online and learn on their own. Even if you fix it for them, it usually reverts back quickly because they don't change the habits that got them there in the first place.

Frquently, you get blamed because your methods "didn't work".

No good deed goes unpunished!

 

[bobodaclown]

LOL. Yeap, I understand. Thanks for the heads up.