Hello,

I have spent over an hour on this forum trying to figure out how to eliminate my mustard algae and don't have a clear answer. I am looking for some basic answers.

Symptoms -

Brownish green material forming on certain vertical areas of my Pebble Tec pool. Around steps, lights, and also on my pool vac and hose. It easily brushes away like dust and reforms in the same spots a few days later. Have had this for about 1 year. Has not gotten worse but is persistant.

Pool Chemistry -

SWG
21,000 gal
Cartridge filters
Pebble Tec finish
pH 8
FC 2
CYA 30
Salt 3000
Temp 68 Deg F

Leslie's recommends Yellowout. This forum seems to say not to use.

Questions -

1. If I wish to shock and kill the algae using bleach what FC level must I reach?

2. How long must I keep it there?

3. How do you measure a FC level greater than 5 if the kit I have only goes up to 5 ppm?

Thanks for the replys.