Desperate for answers on Mustard Algae

[poolrx]

John,

I dealt with Mustard algae 2 years ago. The pool store made things 100 times worse! This forum saved my bacon. I have a 17,00 gal AG pool with a DE filter.
This is what I did:
1st you need your stabilizer level at at least 30 otherwise the sun will start destroying your chlorine as soon as it comes out. Closer to 40 would probably be better. Keep you chlorine b/t 10-15 at all times(use calculator to determine). Add 1 quart of POLY- Poly[oxyethylene(dimethyliminio)ethylene(dimethyliminio )ethylene dichloride] 60% algacide immediately and then another qt in 3 days. Leslies Poly 60 is "Step 4 algae preventer" (link= http://www.lesliespool.com/shopping/...ProductID=8110). I don't know if POOLTRINE 60 is the same! Seems awefully cheap to be true? Do not use yellow out. Trust me! (Or copper for that fact) Only use the Poly 60.
Get your PH as close as possible to 7.3-7.6. If you go too low add a little Borax to bring it back up. Don't worry too much about alkalinity is should stabilize around 100 when you ph stabilizes.
Vacum to waste- not through your filter. Keep in mind that most tap water has a high PH so if you need to add water you may need to compensate with the Muriatic Acid(use small amounts). Also rain has a low ph and a significant amount can lower the PH in the pool. Add Borax to compensate if needed(use small amounts). My algae was gone in a week and has never returned! I use 4oz of poly 60 every Sunday and add about 4 gallons of bleach per week to keep my cl level around 5ppm(stablizer is still around 60-was at 120 when the pool store got done with me-thats another story. My pool has been beautiful ever since. I thank Ben and this forum everytime I go swimming This should work if you can keep your cl level up throughout the day. Try to keep your filter running as much as possible to keep the water circulating and vacum as much of the algae as you can out of the pool. I would probably wait a few days after the 2nd dose of poly 60 before swimming.

Good luck, Joe