Black / Brown algae

[David Kol]

We will try the vitamin c tablet today. We need to pick some up.




cl level this morning 14ppm

David

[David Kol]

We tried the vitamin c rub, and saw no improvement. We rubbed the same spot 3 times.


Is it possible that this is a stain that starts to disapear or get masked at the cl level rises????

If i go to the bottom of the pool and scrub with a fairly stiff brush, I see no particles that are coming loose.

Water tempyesterday got to 84*. Added 1.5 gallon of 5.25% bleach last night to maintain approx. 15ppm cl. ph is 7.4 / 7.5 and cya is 30.

we are running the filter 24/7, and vacuuming daily.

below is a picture of the problem

Thanks

David