I am a pool owner in trouble... as you can guess....
I have a 11,000 GAL in ground plaster pool, tap water.
1/2 HP and Hayward 210T sand filter. Same filter and same pump used to keep it crystal clear last autumn.
Known water params:
PH = 7.6
TA = 90
CYA = ???
TDS = 670
Calcium = ??? (This was OK few months ago.
The issue is that I cannot clear the water, being cloudy/ greenish for the last two weeks
Filter is running 10-12 hours a day.
I shocked it, and it cleaned a lot, but still far from where I know it used to be.
Pool plaster is in poor condition, and needs to be replaced, but I try to get by one more year.
One aspect is that the filter now runs without DE, and the pressure sometimes goes down.... instead of up....
Say one evening runs at 12PSI and in the morning it runs at 10 PSI..... without any changes I am aware of.
A week ago I did open the filter to check the sand and it did not look channelled to me. It needed some sand so I added till sand is about 10 inches from the top. I know the manual says 6 inches.... can this be the main issue?
In the past it used to filter better with 1/3 cup of DE added, now I have to add about one full cup of DE....
Does anyone have any advice?
Thanks in advance