I feel your pain. Just went through the same experience, bought vacuum equipment, had the pool store test the water and sell me stuff.

"Honey, the water is still turning greener and greener..."

Since we just bought the house and I didn't know any of the history of what went into the pool prior to our arriving on the scene, I decided a complete drain down and refill would be best to get me back to a known condition. Clear blue and -way- easier to deal with now. It will cost us about $80 for the 15,000 gallons of new water but you'll spend that chasing the thing with chemicals.

TW

PS: The old control plate in the skimmer was cracked, so I bought a new one with a new rubber stopper -that had a hole drilled through it- for the little piece of rope to keep it tied to the plate. Yeah, that worked. Not.

This was one of those times when a bottom drain came in real handy. The little 1/6 HP sump pump I also bought would haven taken weeks to empty the pool, but it did water the grass well.