I am a first time pool owner, and just got K-2006 test kit today. Here are the results:
CH: 450 ( ~ 500)
CYA: 100 (maybe 110)
Very high CYA, I guess because my pool service guy use several 3" Chlorine Tabs every week...
Plaster pool. No SWG.
So, does this mean that I have to replace 50% of the water?
I have a hayward multiport value (SP740DE), filter-backwaste-booster-waste. Should I use the waste port to drain the water?
Could someone give me any advice on how to replace the water? and roughly how long it will take for the who process, given that my pool is about 15k gal.
Thank you so much in advance!