My dad has black algae in his pool and keeps throwing shock at it which doesn't do a thing. I've been educating myself on this board and use the BBB method on my pool and things are great. I keep telling him something is wrong; algae won't survive if the water chemicals are right. I read to rub triclor tabs on the algae which he did, and it helped. However, there is too much of it.
Dad only tests ph and Clorine with a Wal Mart kit. The numbers show his pool is "in range". I keep explaining he wouldn't have an algea problem if his water was OK. I bought him a Wal Mark kit for $15 that test alk, hardness, CYA, chlorine and pH.
Here are his numbers:
Concrete pool, approx 20,000 gal.
What do you think about this?
Drain the pool about 1/3 down. Take a Stainless Steel brush and dip it in Bleach and attack the black algae. Refill the pool.
Would this help?