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BEAT IT WITH A HAMMER, THEN CALL A TECH!
Worn or damaged filter grids. Replace all grids with holes and recharge filter.
Bad filter elements for a D.E. filter. Remove, clean filter grids and replace damaged grids. Reassemble and recharge with correct amount of D. E. Ken
Your D. E. filter grids are damaged. How old is the filter?
The filter needs to be dismantled to find the damaged elements and replace them. While the filter is down have all the grids inspected and cleaned to determine if more are damaged. Depending upon filter brand there are 8 grids.
Because there is probably a tear in one of your grids inside of the filter that needs fixed.
Install a new filter
Pentair offers everything you will need for the smallest of pools and hot tubs to larger pools. They are most noted for their pool pumps and filters, which are a necessity for any pool.
You have damaged grids inside the filter. Remove and replace. k
You add D.E. to a pool when you do a fresh filter clean. You also add D.E. if you have to backwash your pool more than normal. When you backwash the pool it is also dumping the D.E. out so it needs to be replaced to keep the grids covered so the pool can filter properly. Hope it helped
Probably not going to be adequate.
Definitely cartridge. You do not want to be messing with DE or sand on an indoor pool. I would go for a Pentair 320 sq ft approx (depending on size of pool).