Re: Mustard/Yellow Algae Help PLEASE!
You can leave your alkalinity where it is - I would say it is 90, and that is fine. You will have to keep your chlorine at 15 until the water clears completley, and the chlorine holds overnight. You will also have to keep your FC at a minimum of 6 when finished dealing with mustard algae, as it comes back really quickly. You may also want to add some polyquat 60 algaecide. It won't kill the algae, but it can help prevent it coming back when it is gone.
It is ok to swim with chlorine levels of 15. I have gone swimming in my pool with chlorine up to 25. The only thing you may want to do is to wear an old bathing suit. Mine did not fade even at levels of 25, but I like to warn just in case.
Most important- you should try to keep the chlorine at shock levels, testing as often as you can and bringing it back to 15, 3x a day if you can - being consistant will kill the algae faster, and clear the water. Make sure you brush and backwash often too. Keep it at 15 until the water clears, and the chlorine holds overnight.
Northeast PA
16'x32' kidney 16K gal IG fiberglass pool; Bleach; Hayward 200lb sand filter; Hayward pump; 24hrs; Pf200; well; summer: none; winter: mesh; ; PF:7.5
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