Need help using TF-100

[lipool]

I just got the TF-100 kit and started testing my pool that has been cloudy for several weeks. But I'm a bit confused. Per the basic test, total chlorine is above 5. When I do the Chlorine Drop test, FC and CC is 0. How can that be?

 

[Charlie_R]

How are you doing the DPD-FAS test?

Check this out, and see if you get different results......extended-test-kit-directions-t25081.html

 

[jblizzle]

Welcome to TFP!!!

How much water and how much powder did you use when you did the FAS-DPD test?

 

[lipool]

I followed the Chlorine Drop Test instructions in the TF-100 kit. Reading the link provided by Charlie_R, maybe I need to add another scoop of R-0870 powder. I will try that.

Also, how do I test for CYA that's higher than 100? I can't seem to find a post on that.

 

[YippeeSkippy]

Mix equal parts of pool water with tap water (which contains no CYA). Then using that water perform the test and double the result.

 

[AimeeH]

Also, how do I test for CYA that's higher than 100? I can't seem to find a post on that.[/quote]

You can combine pool water and tap water in a 50/50 mix. Add that to the proper fill level then add your reagent. Your result would then be doubled.

 

[lipool]

Using 2 scoops of R-0870 did the trick. My FC is 35 and CC is 0.5. Now I have to get an accurate reading of my CYA which I know is above 100. I will do the 50/50 trick. Thanks for the help.

 

[jblizzle]

Do the 50/50 as described. If the reading is STILL near or over 100, dump out half of the mix and add more tap water, mix and retest multiplying the result by 4 ... you will lose accuracy, but should give you a little better idea.

 

[linen]

My FC is 35 and CC is 0.5.

Just thought I mention:

Per the basic test, total chlorine is above 5.

If your FC +CC is actually 35.5, the OTO should show a dark orange or brown, not yellow.