My latest set of readings following a big rain showed a big drop in my alkalinity and calcium.
My alk dropped by about 20% for which I am adding 3 lbs of baking soda.
My calcium dropped from 165 to 120, still in the range from the pool calulator (50-300) but in the pool school section a comment "In a vinyl lined pool there is no need for calcium" caught my eye.
Can I stop testing for calcium altogether since I have a vinyl pool?
Note: I have been following the BBB method and everyone is amazed by the sparkling water - thanks.
cya 30 and rising
74 deg F