Preventing algae after closing - mesh cover


New member
May 18, 2018
Batavia Oh
This is my second winter with a mesh safety cover, had to replace my solid one. I had the worst algae on opening the pool last spring so I assume enough sunlight gets in even though it is supposed to be 95% shade.

Do you add additional chemicals during the winter, or use a different mix when closing ?

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
Texas, San Antonio/Marion, South-Central Area
Pool Size
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
Welcome to TFP! :wave: Members have the best success by closing as follows:
1. Close as late as possible
2. Ensure water temps are 60 degrees or lower (colder the better)
3. Ensure water is algae-free. Perform an Overnight Chlorine Loss Test if needed to confirm.
4. Increase the FC to SLAM leve prior to closing per the FC/CYA Chart
5. (Optional); allow FC to fall to about half of SLAM level and use a Polyquat 60 algaecide
6. Open as early as possible

Also see the link below for additional info.

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