Fc vs CL

[poohhbearr]

So Ive been using my kit and have a problem, or a question.
When using the daily test I have 5 parts of CL
When using the FC test I have 3
I have no CC

I don't know which number to go by to add chlorine. If i use the daily test according to that I don't need to add much chlorine. I don't want to do a FC test everyday.

 

[Richard320]

Keep practicing. It took me months to discern the shades on the OTO test. Even now, anything from 4-7 looks like 5 to me. I find it helpful to hold the block at arm's length with a white background (plastic patio chair) and squint until it gets fuzzy.

One thing I find useful is that with 50 CYA, my minimum is 4 FC. I like a little safety cushion. So if the daily test looks as dark as the top of the OTO block, I'm good, and I can just add the normal amount. Anything else, break out the powder and see what's going on.

 

[Kiss4aFrog]

Welcome to TFP poohhbearr

 

[Donldson]

Welcome to TFP

Always trust the FAS-DPD. OTO is fine for daily "yep that is about where it should be" testing to supplement occasional FAS-DPD testing once you get things in to a reliable pattern, but FAS-DPD is the more precise and most accurate test.

 

[poohhbearr]

my oto only goes to 5 how do see a 7? The color is a little darker than 5 probably a 6 or 7 when testing. but why the huge difference in FC if I have no CC. I have a 50% difference in OTO/cl to FC

 

[Richard320]

my oto only goes to 5 how do see a 7? The color is a little darker than 5 probably a 6 or 7 when testing. but why the huge difference in FC if I have no CC. I have a 50% difference in OTO/cl to FC

I know it's 7 because I compared it to the FAS-DPD.

And the shades of OTO are very subtle. When in doubt, trust the FAS-DPD.