cyanuric acid or calcium?

Fill a 5 gal bucket with water & test the ch.
Dissolve some in the bucket of water.
Then test the water for ch again.

*It looks a little chunky for cya to me.

IMG_1880.png
.25 oz is about 1.5 tsp
 
Caution - Do not mix calcium in a small bucket of water. Calcium is exothermic and will generate heat when mixed with water to where it can cause burns or fires.

If the water gets hot when you add the chemical then it is calcium.
 
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