I contacted my pool company today about replenishing 1/3 of the water in my pool to reduce CYA levels, which are currently at 90. They recommended two methods that do not require a submersible sump pump.
1. The first method requires that I shut off my pump for 3-4 hours. Next, I would place an old sock around the end of a garden house (to filter the water from the hose), tape it shut with electrical tape, drop it to the bottom of the pool, turn the water on, and force the old water out the overflow mechanism.
2. The second method involves turning off the pump, turning off the skimmers, and switching the filter to waste to drain 1/3 of the water from my pool.
I am in Houston and it is pretty hot out here. The pool company prefers the first method because it keeps water in the pool at all times and reduces the risk of filming around the pool that can occur when you drain it.
Which method is the best?