I have in ground 16x32 that works just fine. (Hayward DE, 1.5 super-pump hp, grid system) Any issues over the last 20yrs I've solved quite well (mechanics, equipment, chemistry) so I have experience but now I'm trying to help my sister-in-law with an above ground pool,( not sure of the size..possibly 14x28 oval as a guess)
Last year she had continual problems with a new filter and pump (Hayward EC40DE/ 1HP power matrix I believe) Seems that pressure would double very quickly ( 10-15 minutes, even after bumping, and even after backwashing)
Because she did not bring the system in for the winter or drain it properly she cracked lots of components, both filter and basket housing. Rather than spend quite a bit on multiple part replacements I purchased a new system last week and installed it today. (Hayward EC50 with the larger 1.5 pump. (Overkill I know)
The extra power was impressive, but much like last year the pressure jumped rapidly after 10-15 minute upon INITIAL use. Bumping returns good pressure but only for 10 minutes. Since this was the FIRST use of a new pump/filter, I can't believe that the filter could be clogged so rapidly. The pool does have lots of suspended particles and algea since this is really the "startup" for the season. (Pool was also shocked heavily)
#1 Do you think that possibly too much DE was used for the initial coating? ( Maybe she did that last year too?) ( I used only 4 full scoops this year for a 24 SQ' area). I was thinking of backwashing and adding less DE to see if that helps, but I certainly want to make sure the elements are covered.)
OR.. #2...Filter is real dirty (that quick?) (Hard to imagine since the brand new/pump filter only ran for about 15 minutes and vacuuming has not been done yet, so any bottom residue has not been sucked up yet)
The fact that the quick pressure rise happened with both filters (last year and this) has me baffled. Being an above ground system theres no piping/plumbing to check other than the two short hoses leading in and out of the filter/pump. And since the flow is very good for that first 15 minute those hoses can't be the issue.
Any thoughts? Too much DE? Dirty filter that quick? Something else?..thanks