Unfortunately I bought this $75 kit before finding this forum. I'm sure it's fine and I will get the recommended additional kit. I have tested the CYA several times and that black dot NEVER disappears. It does fade.
Also, the chlorine reading - it appears the TC and FC are the same, so my reading is zero? I might not understand how to read the comparator tube. They both read as 3. My pool water is clear.
I am asking because I have another question and I know you will need the chemistry. Here's the other question:
The Aqua rite chlorine generator lights are all off and cannot get a reading. I have learned through this forum to change the "black quarter" part. I have ordered the part and am waiting. I also found the yellow wire to the fuse is burnt and changed the connector. The board is 2 years old according to the prior owner and it worked until we started trying to fix the pool light (install relay and hook up wires). Pool light is another question for another day!
PH is 8 with 1 drop to restore to 7.4
Calcium turns red with 20 drops to turn purple.
alkalinity is 60ppm
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I have a cartridge filter - not clay. need to change my signature.