I received my TF-100 Testkit about two weeks ago and have been doing a full set of tests every five days or so. So far my weekly results seem to be precise, (I have been also taking a water sample to the pool store, to compare results, since I'm not completely confident with my testing ability yet. The poolstore I go to uses a Lamotte Waterlink Express), with the exception of the CC test
Initially I chalked it up to just learning how to do the test, Now I'm not so sure. Before I delve into the test results, here is some background on my pool.
25,000 gallon 18x36 IG Pool with a liner. Currently, I am using the Sustain system for chlorination (Unfortunately these chemicals were bought in advance, so i can't justify switching over to BBB quite yet (though I'd like to)). Thanks to you guys the water has been sparkling clear for the past three weeks.
EDIT: the following tests were taken over the course of two weeks, Test #3 is the most current taken 6/29
Test #1 (TF-100 / Store results)
FC: 2 / 1.7
CC: 3.5 / .82
FC: 5.5 / 5.7
CC: 4 / .13
pH: 7.5 / 7.4
Calcium: 330/ 310
CYA: 30 / 30
FC: 3.5 / 3.72
CC: 4 / .13
My testing procedure for the last test was
1) Rinsed out sample container marked chlorine only using pool water repeatedly
2) Obtain sample by filling container marked chlorine only to the 10 mL
3) Performed FC test by adding a scoop of R-0870 DPD powder, mixing. Solution turned pink
4) Swirled and added drops of R-0871 until the solution was clear. This took 7 drops.. recorded FC as 3.5
5) To the same solution added 5 drops of R-0003. Solution turned bright pink/red. Again added and swirled drops of R-0871 until solution was clear. This took 8 drops. recorded CC as 4.0.
Is this procedure correct or am I missing something? Are there any interference issues that I should be aware of? The only thing I've found by googling was
-- http://www.taylortechnologies.com/produ ... opTest.pdfFAS-DPD is available in stand-alone kits to measure chlorine or bromine, and in combination with other common
tests. Supplement this test with Deox Reagent when testing chlorine in the presence of monopersulfate shocks or
interference will cause a false-high
combined chlorine reading.
Are there any issues with Sustain and the DPD-FAS test. As far as I know the sustain tabs are cal-hypo based, not MPS. Not sure about the Summer Shield aspect of the system.
Can anything else cause false highs in CC?
On a completely unrelated note: my R-0010 reagent is labeled as an Alkalinity test, but it is only used in the calcium hardness test. Is this correct?
Thanks for your time,