For more information on this pool see How to vacuum to waste correctly . Zea3
I have friend who just took off the cover of her 18x36 swamp. They just purchased the house in December. Of course, pictures of the house when it was on the market showed a pretty blue pool, but I'm suspecting the pictures weren't from last year. I wouldn't be surprised if the pool has been covered for a few years. The only way you can tell the which end is the deep end is from the diving board bolts. You can literally only see about 18" into it. I measured CYA and it's less than 30 (probably <20, but I only used 10 ml of water since I was assuming the level would be high so I couldn't fill past the 30 mark. I know there is some CYA, since the water was a bit cloudy, but not much. Anyway, I told her if it were my pool, I would seriously consider draining and refilling. It would cost <$150 in water to refill, and I'm thinking she could easily spend more than that on bleach (or whatever chlorinating agent she chose, the only other reasonable choice being cal-hypo since pH is right on target at 7.2 and dichlor or trichlor would mess with that) to try to kill the green monster. Based on the color of the water, I'm thinking the slam will take AT LEAST a week and probably 2! Do you agree that she should look for a place to drain? Figured I'd see what the experts say about the draining option before she wastes CYA to bring it to 30 and SLAM.
PS I told her last month she should uncover it while the water temp was sure to still be <60, but she just never found the time. It may have still been green even then, but it would have been much easier to SLAM!