shorembo
07-25-2014, 01:11 PM
My pool is:
Crystalcrete
Outdoor / unscreened
17,000 gallons
Salt generator
12 years old
Hayward C1750 Cartridge filter
My problem is that for the life of my pool, I would get a few small black spots in etched holes in the concrete starting in late summer. The black stuff had was really dark green (like spinach) and didn't smear too well.
This usually went away by brushing the pool then sprinkling chlorine (originally used some Black Spot crystals then I switched over to just a regular pack of shock) and let it settle to the bottom of the pool overnight (without running the pump). The above process usually took care of things.
It seems this summer my attack is worse. I am now getting the same stuff in the tile grout around the water line. I have tried the chlorine crystal treatment a few times but it just seems to be alot worse this year.
Is there any help?
(Not that this might make a difference but I was using Jacks Magic for a number of years regulary but quit using it around two years ago).
Crystalcrete
Outdoor / unscreened
17,000 gallons
Salt generator
12 years old
Hayward C1750 Cartridge filter
My problem is that for the life of my pool, I would get a few small black spots in etched holes in the concrete starting in late summer. The black stuff had was really dark green (like spinach) and didn't smear too well.
This usually went away by brushing the pool then sprinkling chlorine (originally used some Black Spot crystals then I switched over to just a regular pack of shock) and let it settle to the bottom of the pool overnight (without running the pump). The above process usually took care of things.
It seems this summer my attack is worse. I am now getting the same stuff in the tile grout around the water line. I have tried the chlorine crystal treatment a few times but it just seems to be alot worse this year.
Is there any help?
(Not that this might make a difference but I was using Jacks Magic for a number of years regulary but quit using it around two years ago).