Hi, I am confused about one point. I have a 60 sq ft Pentair FNS 60 filter. Every 30 days or so when the pressure goes up, I backwash the filter and add 7 standard scoops of DE. Is this the same amount I would add when I do complete tear down of filter and wash out with a hose? Or do I need more (10 scoops) DE? THANKS
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