backwashing my DE filter in the past caused me to have to keep adding water. I have a well and lots of Iron here in NEW England, so everytime I add water I tax my well and I have to add metal-out. I do like however the crystal clear water. Have you had a cart filter and got rid of it because of the constant cleaning?

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The backwashing water loss is an issue with DE or sand. I've considered Slime Bags, which claim to be able to clean your backwash water enough to discharge it back into the pool. Whether that would be less trouble than cleaning a cartridge, I don't know. 
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