I'm completely new to pool ownership but I'm having to learn quickly. Here is my problem. We opened the pool for the first time (closed by previous owners) and are now having issues. The pH was really low at 6.2, clearly no chlorine and they had been using copper for algae and left us a bottle and told us to dump it in on opening so we did. Now I have shocked, and been raising the pH but now my CYA levels are suddenly sky high at 150. Turned off the chlorinator and raised the chlorine level with bleach (it was only 2).

So here is where I am.

35,000 gallon, in ground vinyl pool with no main drain (thanks previous owners) just skimmers.

Free chlorine is 5.0
Combined chlorine is 0.4
pH up to 7.6
TA 180
CYA 150

Water is crystal clear.

Chlorinator off, using bleach (much to the pool companies disagreeing) to keep chlorine around 5.

Back flushing and wasting with vacuuming but I can only empty to bottom of skimmers and more importantly I can only fill off my well...VERY slowly.

So here is my question. I know I have to replace water. The pool companies insist simply converting to liquid chlorine of some sort and doing the usual backflushing but with vacuuming to waste that I can slowly lower the CYA and that will be enough over the summer so as not to stress my well. But both of these companies also insisted that high levels of CYA wouldn't effect my needed shock levels and that "4 bottles of liquid shock" would be enough (mind you they didn't even ask what my current chlorine levels is).

Is this true or do I need to find a way to empty more with a submersible pump and some how get a pool water company into my backyard? Can I just keep going and shock as needed for blooms or is this going to be a never ending project?

I'm petrified every time I go outside that my pool will be green and I'm a full two weeks into pool ownership with my first major crisis.

THANK YOU!!!!
Mindi