My ch is down to 1.2 in a 13k pool. Went as always to pool calc and since I don't have bleach high enough I just insert 12% which I have. Also ph is 7.8. Ok now I poured in the muriatic acid but the calc said 37 oz of ch OR 4 oz of 73% calcium hypo. Maybe I'm reading too much into this as it doesn't seem enough to raise my ch to even 3.8. A little assistance please