Well, step number one is to give us your test results...hopefully from your own drops-based kit. Avoid test stips, but you probably already know this.
Looking at the water in a cup is not a good comparison. You're looking through 4" of water. It's got to be really funky to not be able to see through that. Looking through 5' of it is where you see the funk.
You need to get your Cl up to the 15 ppm range. You didn't mention the size of your pool, so I can't give you a starting number. However, I can tell you that the only thing that is going to solve your problem is Cl, and lots of it. Do you have a recirc setting on your pump? That may help getting the Cl distributed about. Once the algae is killed off, it won't plug your filter as fast. Sounds odd, but it's true.
Worst case you can dilute the bleach 50% and cast it out in a bucket to disperse it over the surface. That way you shouldn't damage your liner, and you can start killing off the algae so you can clear the pool.
Michael


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. What I meant was that during the winterizing process, the filter was opened up and cleaned. I called it Grids, but it may be fingers. Also I thought it was called backwashing what I'm doing, but maybe I'm wrong. When I say backwash, I mean I push the handle at the top down slowly and then up quickly 6-8 times which removes the DE (the filter manual calls that process 'bumping'). Then I open the drain valve and let the water and DE drain out. I then turn on the pump to further clean it and get the gunck out. I then close the drain valve, start her back up, and then add more DE.
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