I was just thinking that myself, I went and got new Nitrate, Phosphate, and Ammonia test kits today.I really didn't see much difference in Results.Nitrates are 0 still, Ammonia is 0 still, But I did see a difference on the phosphates, 0.2., formerly tested at 0.I did a calcium test, it was 500, not horrible, but not what I prefer.ALK is 10dKH.Magnesium is 1400.