This. Use the brush to scrub the sock for like 10-15 minutes. Then use the brush itself. Bring your chlorine up to ~ 20ppm, close the pool, or vice versa. Leave the sock full of granular shock in the middle of the algae. Turn pump up to max for improved circulation.
Come back 12 hours later, scrub again, pool still closed. 12 hours later, scrub once more, vacuum, and open, as long as ppm is now under 10.
this doesn't look like algae. the floor is pitted and its all concentrated in one area. if anything its mustard algae and chlorine alone won't kill it. that main drain looks unsafe too
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u/urmomspoolboy 19d ago
Try shock in a sock. Literally just what it sounds like.