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Which System 3 do you have? Modular media is a cartridge system and needs to be manually hosed off, the other has DE which must be added after backwashing (see this for some more info on DE filters).
As you use the term "backwash" I assume that it's the DE type, however - you don't mention 'recharging' the DE - the canisters (which look a lot like cart filters on this model) are probably congested from being uncoated with DEPlease check out the link I gave and see if that doesn't help you.
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