I understand the TF-100 CYA test is a bit subjective, but anyone have tips to get reliable results? I, for one, tend to see a faint black dot for quite a while and wonder if I'm going way past and registering low CYA readings as a result. Second, I'm not sure about the protocol for shaking the bottle after the 30sec wait. I give it about 10 vigorous shakes, but wonder if there's a more standard way of doing it.
As regards to lowering CYA, is it correct that it concentrates at the top, so draining the surface water via the skimmer is more effective at lowering CYA levels?
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