Ok, you've got a mess. (I think you may have worked that bit out already, without my help)

Lessee. You've added Yellow Treat and PhosFree. You've put DE in via the skimmer and it shot back into the pool. And, there may be other stuff in there from last summer.

Also, you've got brown dust, intermittently green water and gold (??) flakes. Plus you've got a spring somewhere near that you can get water from?

Plus, you've got acorns, leaves, pollen and other bits of nature's bounty in your pool.

Eureka! I've got it -- you're trying to make hobo stew in forest colors?

Or, maybe not.

But . . . you can officially color me uncertain. I don't know what's happening. I've never known a liner pool to have algae without having a slimy feel to the liner. Of course, I've mostly worked with large concrete commercial pools, so maybe you can have algae without slime. But, adding chlorine to algae doesn't make it turn colors. I've never seen gold flakes in a pool.

There's another possibility: if you've added enough Yellow Treat (sodium bromide) you are going to create brown bromine gas when you add chlorine at lower pH. Possibly, it could look green against a blue liner. But brown dust usually either means dead algae or iron precipitating out of the water.

At least one thing seems clear. When you add DE to a properly functioning sand filter, it won't return to the pool. Let me suggest the following:

1. Buy 5 boxes or so of borax, and start adding it (slowly, 1 box at a time, thru the skimmer with the pump running -- do NOT choke the skimmer!) till you get the pH to 7.6 or above. (Some of the not-so-nice reactions that can occur when cleaning up a pool are nicer at higher pH levels.)

2. Vacuum and clean up all the leaves and large debris.

3. Have your filter serviced with new filter sand -- check the bags the service guy users; do NOT let him use unlabeled sand. (If it's labeled sandblast sand, report the sand particle size info HERE before he installs it. Only trust size info printed on the bag, or else from a mfg sheet correlating the bag label with sand particle size. "JC20" is a size you do NOT want.)

4. Meanwhile, keep your pH up above 7.5 and your chlorine up above 3 ppm.

Report back once the filter's fixed, or if anything strange happens before then. If you maintain chlorine and pH, and do NOT add anything else*, there's a fair chance your pool will be on its way to recovery by then. If not, we'll start there.

PoolDoc

* You will need to add a lot of P.O.P. -- Pool Owner Patience! If you get impatient, and add more pool store goo, you'll almost certainly make things worse.