Hi. we recently got a new small vinyl ring pool. 15'x42" round 3400 Gal. I didn't think we put enough chlorine in to start after a week the floor became discolored. Thinking it was algae of some kind I got the FC up to 10+ for about 2 days trying to get rid of it. unfortunately a storm came through and knocked off the filter and all the water drained. So we replenished the water fresh and got the FC back to 10+ to try to get rid of the discoloration. After a week the FC has come down to 3 but the discoloration has increased slightly.
Any ideas what the discoloration is, how to get rid of it, and if it's safe to swim with it on the floor? Thanks