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Thread: Red Algae (Bacteria - now what?

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    Red Algae (Bacteria - now what?

    Just found red algae (bacteria) in my pool - have started the SLAM process - shocked to FC level of 20 (CYA=40) and am continuing to add chlorine until the 3 criteria are met. Pool ladder was covered with red slime so removed from pool and sprayed with chlorine solution - also floaties. Solar cover has been off of the pool during this process. Wondering when it is safe to place the solar cover back on the pool? Also, will the cover re-infect the pool with red algae? We will be gone for about 1 week beginning Thursday - not sure if I should replace the solar cover on the pool or leave off. Any suggestions or recommendations are appreciated. Thanks in advance.
    Above ground 17,000 gallon vinyl lined
    DE filter

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    Mod Squad tim5055's Avatar
    Join Date
    May 2014
    Columbia, SC

    Re: Red Algae (Bacteria - now what?

    Well, I found this post

    Quote Originally Posted by BoDarville View Post
    The pink, slimy growth that is often referred to as “Pink Algae” is technically not an algae but rather a bacterium of the genus Methylobacterium. Pigments within its cells give it its distinctive pink color. The slime formed around the bacteria provides it with a high level of protection which is why it does not brush off easily. In addition to clinging to the walls of a pool, it has an affinity for PVC plastics and will attach itself to both the inside and the outside of PVC materials that are a part of, or attached to, the pool. This includes your pool’s plumbing as well as your cleaner/vacuum. There was a large outbreak of this around here a couple of years ago, late in the season. The most common cause is letting FC get too low for the CYA level - even for a short while.

    Because it is a bacterium, algaecides will not prevent or get rid of this. However, SLAMming the pool with chlorine will. When SLAMming, be sure to clean behind the light fixture, if your pool has one, as well as around any ladders and underneath any removable steps. Treat any pool toys/floats as well with a water/chlorine solution. Since this slime can attach itself to the plumbing (meaning in places you cannot see it), it would be a good idea to maintain your FC on the high side of the target range for a few weeks or so after completing the SLAM process just to be on the safe side.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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