Hey guys I converted over about a month ago after seeing how high my CYA was and having some algae issues due to keeping the FC at 4-5 based on recommended levels(without taking CYA into account.). I drained about a third out, there has been a lot of evap and now with all the rain in the Carolinas had to drain about 4 inches out. That being said it still shows a CYA of 160-180.
- In testing CYA I use my Taylor kit and mix 10ML of pool water with 30 ML of distilled for a 4:1 ration. Mix this well, fill to 7ML in the bottle and add 7ML of reagent. mix that and in the sight tube I get between 40-45 tried it a few times. This has been a fairly consistant number and I would have thought it would have dropped after the rain and such the last month but not so. Based on this I have kept the FC at 15 for the last month. I didn't have the FAS-DPD in my kit and used a 3:1 dilution and estimated around 5 so that should be around 15.
- I got my new FAS-DPD addition kit yesterday and measured 18. I used a 2:1 dilution to save on reagent. I got 18 drops which s a FC of 9 and multiply by 2 to get a FC of 18. THis is acceptable to do this right? My CC was zero as adding the CC reagent didn't turn it pink.
- I noticed that there was some algae on the walls, and the pool floor was covered in a greenish brown. Could this be dead algae? I would think with my FC in that range I shouldn't have a issue. Pool temp is around 65.
- Since I had some algae I decided to do a FC demand overnight and today there was no FC loss and is zero. If there was a algae issue it should have dropped correct? Pool is crystal clear. I vacuumed it all up and let the filter run a hour and will clean filter out.
- In order to test PH, I know anything over 10 gives you false readings. Is it acceptable to dilute 2:1 to bring test water to 9 and then do PH? I did that and got 7.4.
So one thing I noticed is that my liner appears to be losing the its color in a couple places on the floor and pattern turning white. I am concerned that running that high of chlorine is fading my vinyl liner has anyone else had issues running that high of FC due to CYA and had liner failure? In order for me to eliminate the CYA I have to replace 80% of my water. Ive been advised not to remove more than 6-8" of water at a time with a vinyl pool, and then refill and repeat. However doing that its going to take a lot more than 80% as I am not removing it all at once. I am very tempted in trying that CYA reducing enzyme but its up in the air whether it really works. Bottom line is I need to get control of my CYA.