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Is the TF-100 CH test accurate when the CH is at a low level? The instruction says, I think, that when CH is low, divide the number in half - is this right? I thought that my water was soft - I've tested it with 2 local Leslie's and the results were both on the low side, like 180, but the...

It looks like my skimmer's suction isn't getting the surface dust into the filter. I'm thinking of putting in a skimmer flap/weir to help. Is there a particular brand that's better or any tip you have on this?