Not able to reply to “Snakeoil?” Question referencing a copper sulphate/ zinc sulphate product - but noted just the one component in HTH tabs im looking at at WalMart… perhaps the reply that Wicked-Pedia inspired about this chemical controlling moss growth means it somehow controls pool algae also…. I’d be willing to try these as with HTH fillers (-) the WalMART lower price for equal container, it would be a good cheap experiment - maybe in my inground - added dark blue vinyl liner - customer pool - don’t wanna try in a plaster pool… 
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