need-for-speed Posted September 7, 2014 Report Share Posted September 7, 2014 Our pool is algae free except one spot. The side of the hot tub that faces west is brown. I'm pretty sure it's algae. Scrubbing with a wire brush doesn't phase it. I was thinking of draining the hot tub and scrubbing that wall,with muratic acid. Maybe diluted? Is that ok to do or will it harm the pebble Tec ? Quote Link to comment Share on other sites More sharing options...
MikeThePoolman Posted September 9, 2014 Report Share Posted September 9, 2014 Draining a swimming pool is a last resort for me. I've had success using the Pool Rx for all algae issues, including black algae. The Pool Rx key: the Pool Rx is most effective when the cyanuric acid (conditioner) level is below 30 ppm (and you probably already know that the only way to lower conditioner levels are to drain and refill with fresh water). If draining is your only option you can scrub the algae spores with a wire brush and then pour liquid chlorine (sodium hypochlorite) over the algae to kill it. Some people like muriatic acid over black algae but i prefer liquid chlorine. WHATEVER YOU DO, DON'T COMBINE CHLORINE AND ACID!! Happy Algae Killing, Mike Quote Link to comment Share on other sites More sharing options...
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