I have an above ground pool (intex) 24' round with a hayward EC-50 and 1 horse pump. The unit worked fine the first year of operation. Last year and this years startup have been troublesome. I have constant high pressure after a short period of time. Last year I would have to "bump" everyday and completely changed out the DE once a week. After shocking pressure would rise fast. (expected). bumping would only work a little bit...I was constantly attending to the filter. I have done an acid wash, completely disassembled the unit and washed by hand and so forth. I want to stay with DE. I like the quality of the water. But I do not want to be constantly baby sitting this filter. Pressure after charging always is about 9 and I will go up to 18 or 20 within a couple hours. Even in a clear pool. I was thinking of going with a vertical grid filter, but I only see those available for inground pools. I need some help and suggestions.