Algae has taken over pool

[JMLBacon]

I need advice on how to move forward. Two years ago we had our inground pool redone; fiberglass, saline, pentair equipment. The pentair salt converter has failed. This is the second one that has failed. It has been 10 weeks. Initially, we were trying to control the algae with chlorine and yellow/green out and shock treatments. The pool supply store told us we were throwing our money away, until the part is replaced it was of no value to put the chemicals in the pool. The algae has now taken over. I can no longer brush the algae from the sides of the pool. I have a swamp in my backyard.
This part is under warrenty, Allens Pools said they ordered the part from Pentair. Allen's will no longer return our calls. Pentair says Allen Pools has never ordered the part. The part cost is about 500.00.
Can I drain the pool? Any idea on whether the pool surface has been so badly damaged that it will need be resurfaced.

Thanks,
JMB

[poolgeek]

until the part is replaced it was of no value to put the chemicals in the pool

You should have been chlorinating after the SWG died. Shock the pool and keep the free chlorine high and pH regular until the water clears.

What is the CYA level?