I unhooked the sand because I got a new cartridge for my old filter. I thought the cart filters better then the sand. I could easily hook it up again.

Do you then think its a filtration issue? I ran the cart overnight and all day a few days ago. The cart is new and has not raised in pressure. I did hose it off and just white water sprayed off it. I was thinking it was still a metals issue.

You say the sand with DE would be superior to the cart?

I was adding DE to the sand when the pool was cloudy from the previous posts. 1/2 cup raised pressure about 1 psi. The pressure would rise with it. Starts at 15 and goes to about 19. With out DE it does not rise. Just like the cart.

I guess I will try the sand and DE again.

I read about the sock but never used them. What will it catch?

Anything else to try?