Can find cause of all the dirt/sand in the pool

[nicole12]

18' round AG pool, 150lb sand filter, 1.5hp filter...Astral Pool filter/pump came as a set. Also use about 3/4 c. of DE in sand filter.

Had the pool for 4 years now.

I've been having this problem all season. Everyday I vacuum the pool and then every morning I wake up to dirt/sand in every crevice/low spot in the liner.

I can't seem to find what is causing this. Pool filter or nature.

First I can rule out filter sand, what is at the bottom of the pool is so fine when you touch it with your finger you can't even feel it. I had a problem with filter sand last year and know this isn't it.

I put some panty hose of the return to see if anything was coming out. I did notice when I vacuumed there was be a little bit of sand/debris in the panty hose, probably less than 1/8 of a teaspoon. I had the panty hose on for about 4 days and did notice the pool was alot cleaner but there was nothing in the panty hose so I took it off yesterday and later that night all the fine dirt at the bottom of the pool.

Last time I vacuumed I did use the skimmer sock to stop the fine silt from getting into the filter and also had the panty hose on the return. Today I did not have that when I vacuumed.

Also yesterday I mowed the lawn and the pool does sit at the lowest point of the yard so not sure if it's just a coincidence or not.

I guess what I'm leaning towards is that when I vacuum for some reason what I vacuum just tends to go right through the filter back into the pool. Does this make sense and if so is the only way to fix it is to reduce the h.p on my pump?

I put the panty hose back on the return and I guess I will leave it there until the dirt/sand reappears in the pool so I can rule out the filter/pump.

It's just tough because there are so many variables that could lead me to one conclusion and not what the real problem could be.

I'm just really discouraged/frustrated at this point.