CYA Level Somehow Increased

[JohnT]

Thanks for response JohnT

Dimensions are 22x27x45 Lagoon
40" in shallow end and 8' in deep end

That IS a bigun. The only thing I can think of would be some possible dirt, algae or chemicals in the water giving you higher turbidity than normal. It can look crystal clear but have enough in it to skew the CYA test.