PS200 Chlorine Chart - Am I color blind?!

[waterbear]

most men have more trouble distinguishing colors on the comparator block than women do. Don't know the reason but it's been documented. I have also read that with practice that men can learn to differentiate between the slight shade differences on the comparator, especially if they have a woman look at the block also and compare notes, so to speak. I know this isn't much help but you might want to test with the FAS-DPD for TC which will give you a definite endpoint so there is no question and then with OTO so you can learn what the results are supposed to look like.

[sharknj]

Thanks all. Glad to see it's not just me! I'll probably just continue what I'm doing then- test weekly with the FAS-DPD and occasionally in between with the PS200. I have an Aquarite, so I'm usually just making sure I have a decent Cl and pH reading every couple of days. It seems to stay pretty constant with the Cl, and the pH climbs gradually as expected between the muriatic acid doses.

Thanks,
Steve