You don't have a salt water pool, so your CYA really didn't need to be much higher than 40 in your area I wouldn't think. You seem to be saying the black dot is disappearing quite fast when looking down the viewing tube to get such a high reading. I wonder if it's not the other way around or something where your CYA is actually low? I'm a bit confused myself now, and the lack of CYA protecting FC from the sun is the only thing that makes sense. So if any of this seems odd, let me know or explain so we can ensure the CYA testing and reading is spot-on.Proper lighting is critical for the CYA test, so you want to test for CYA outside on a bright sunny day. Taylor recommends standing outside with your back to the sun and the view tube in the shade of your body. Use the mixing bottle to combine/gently mix the required amounts of pool water and R-0013 reagent, let sit for 30 seconds, then gently mix again. Then, while holding the skinny tube with the black dot at waist level, begin squirting the mixed solution into the skinny tube. Watch the black dot until it completely disappears. Once it disappears, record the CYA reading. After the first test, you can pour the mixed solution from the skinny view tube back to the mixing bottle, shake, and do the same test a second, third, or fourth time to instill consistency in your technique, become more comfortable with the testing, and validate the CYA reading.
I'd like to know more about this issue? Was this happening prior to your conversion? There should be no loud gurgling sounds or air being expelled from the pool returns. Also, a leaking filter valve is not good and should be fixed as soon as possible. While this may have nothing to do with the chemistry directly, lose of prime in the pump and poor water circulation can be a problem for the overall pool sanitation.At this point the only other issue with my pool is the loud gurgling ( sounds like shaking rocks in a soda can) and air that is expelled from the return probably at least every 7-10 minutes. I bought a new pump strainer cover used Magic Lube and replaced the old one; and there is no air bubbles in the pump strainer. I also think the return port of my Hayward filter valve must have a crack as it is leaking, even though I tried twice, then bought a new connector and tried twice again with Teflon tape and couldn't stop the leak.