Are these numbers correct?

[c5-1]

Just did a test

FC 4
Cc 0
TC 4
Ph 7.5
TA 110
Ch 220
Cya 65

I'm using the TF 100 kit. The reason why I ask is because when I did the 5 drop test with the R600 it showed about 1 in chlorine but the R870 test tells me it's at 4?

 

[jblizzle]

Trust the FAS-DPD. Too hard to actually distinguish the shades of yellow.

CYA is a little on the high side, but livable ... although with that CYA, your minimum FC level is 5ppm.

 

[BoDarville]

I would trust the numbers obtained with the R-870 powder (FAS-DPD). Just to be clear, when you say you got an FC reading of 4 using the FAS-DPD, you first added the R-870 powder to the sample and then added 8 drops of the R-871 get the sample to turn clear to arrive at FC of 4, right?

 

[c5-1]

I would trust the numbers obtained with the R-870 powder (FAS-DPD). Just to be clear, when you say you got an FC reading of 4 using the FAS-DPD, you first added the R-870 powder to the sample and then added 8 drops of the R-871 get the sample to turn clear to arrive at FC of 4, right?

Yes FC was 1/2 of 8

 

[c5-1]

Trust the FAS-DPD. Too hard to actually distinguish the shades of yellow.

CYA is a little on the high side, but livable ... although with that CYA, your minimum FC level is 5ppm.

Pool school says 30-50 and TF testers says 30-80. Which one to follow?

 

[jblizzle]

Non-saltwater pools use the 30 to 50 ppm recommendation.

 

[c5-1]

What about the other numbers...do they seem ok?

 

[jblizzle]

Sure. TA is a little high but nothing to worry about.

 

[BoDarville]

Your other numbers look fine. Just keep an eye on CH. It is borderline low for a plaster pool. However, since CH often increases due to water evaporation and top-off, it may come up on its own through regular top-offs (water evaporates, but calcium does not). Probably worth your while to check your fill water CH level. If there are noticeable fill water levels of CH, CH levels in the pool will go up any time you add water to replace evaporation. However, if the CH level drops from current levels, I would increase it to around 250 ppm.