So my pool had turned green while I was out of town and it was recommended that I perform a SLAM and then use the TF-100 kit for accurate results to complete it. Well I followed the basic recipe and bumped my FC levels up according to the FC / CYA chart and within 6 days it was crystal clear again. Now I wanted to perform the over night chlorine loss test and this is where it all fell apart.
The SLAM video says to take an accurate measurement the night before and then again in the morning and make sure you have no more than 1 PPM loss of FC. So last night I perform the test and then immediately tested it again, and again, and again, and 5 more times for a total of 8 tests and cannot get repeatable results. If that's the case how am I to validate in the morning I only lost 1 PPM?
Last night the number of drops in the FAS/DPD test to change the liquid clear was:
28, 30, 27, 32, 24, 30, 31, 29. So my FC was anywhere from 12 ~ 15.5 PPM.
Then this morning I ran the test 3 times before giving up. I already knew from last night I wasn't going to get anywhere with this. I got:
30, 29, 32. So my FC was 15 ~ 16 PPM.
That's unfortunately useless information.
I was as overly accurate as best I can. I even resorted to using a dropper and slowly dripping in while carefully watching the water level and tried to hit the 10 mm line exactly the same each time. Like down to the drop accuracy between tests.
The instructions say to use a heaping scoop of R-0870 and that the exact amount is not that important. However I got really particular about it and made sure I was heaping exact same sizes each time to try and eliminate variables.
When dropping in the R-0871 I made sure I held the bottle the same way each time, squeezed as consistently each time and dripped in about 1 drop per 1 second for the first 20 drops and then much slower after that working in 2 drops at a time till I could see the color fading out and then 1 drop at a time. I repeated over and over as you can tell and just cannot get consistent results. How are you supposed to test 1 PPM difference between day and night when I can't even do it back to back?
Is it just me or how are others getting this to work right? or is there something wrong with my kit?
Thanks for any feed back and help
Malcolm
The SLAM video says to take an accurate measurement the night before and then again in the morning and make sure you have no more than 1 PPM loss of FC. So last night I perform the test and then immediately tested it again, and again, and again, and 5 more times for a total of 8 tests and cannot get repeatable results. If that's the case how am I to validate in the morning I only lost 1 PPM?
Last night the number of drops in the FAS/DPD test to change the liquid clear was:
28, 30, 27, 32, 24, 30, 31, 29. So my FC was anywhere from 12 ~ 15.5 PPM.
Then this morning I ran the test 3 times before giving up. I already knew from last night I wasn't going to get anywhere with this. I got:
30, 29, 32. So my FC was 15 ~ 16 PPM.
That's unfortunately useless information.
I was as overly accurate as best I can. I even resorted to using a dropper and slowly dripping in while carefully watching the water level and tried to hit the 10 mm line exactly the same each time. Like down to the drop accuracy between tests.
The instructions say to use a heaping scoop of R-0870 and that the exact amount is not that important. However I got really particular about it and made sure I was heaping exact same sizes each time to try and eliminate variables.
When dropping in the R-0871 I made sure I held the bottle the same way each time, squeezed as consistently each time and dripped in about 1 drop per 1 second for the first 20 drops and then much slower after that working in 2 drops at a time till I could see the color fading out and then 1 drop at a time. I repeated over and over as you can tell and just cannot get consistent results. How are you supposed to test 1 PPM difference between day and night when I can't even do it back to back?
Is it just me or how are others getting this to work right? or is there something wrong with my kit?
Thanks for any feed back and help
Malcolm