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Need a hand if possible on how many pounds of DE to add after backwashing. I have a 60 Sft Hayward filter model DE6020 thanks!

1st post to the forum - looking forward to learning a lot from everyone. If I'm not posting in the right forum please let me know. I'm unable to eliminate the mustard algae due to the high CYA. I'm thinking draining and refilling is the best way to go. If I do drain, what are the step I should...