Ph And Copper Problem

[live2ridetahoe]

Dang, I posted this in the hot tub section first. Such a noob move..

Hi all. Long time looker, first time poster here. I have been having a problem the past few weeks with copper and a low pH of 6.0. I have been trying to add soda ash to raise the pH of the pool. I have a 13000 gal vinyl lined pool. I have been unable to get the pH up. I just ended up turning the pool cloudy and having green/blue dust on the bottom of the pool.

My pool has copper pipes for both the drain and return lines. I recently disconnected the heater and took that out of the equation. I have tried adding some metal-b-gone products and eventually drained 10000 gallons and refilled.

My pH after refilling was still over 5. My pH was 7,0. I have added more soda ash and tried to balance everything without success. I let the pool sit for 2 days and vacummed out a nice layer of green/blue powder from the bottom of the pool yesterday. I ran the filter for a couple of hours and have let the pool sit overnight. I added more water and will let it sit until tomorrow. I plan to vacuum tomorrow and retest the water.

Where do I go from here?

Thanks for any advice.

JG