Since my pool was built I have had a pool service perform weekly "full service". I'm new to TFP and the TFP method; this afternoon I performed my first test with the TF-100. The results are:
* TA: 130
* CYA: 115
TA clarification: step 3 in the TA instructions says to add "until the color changes to red"... 13 drops and it was pinkish/redish while at 16 is was more clearly red - I stopped there. If had I continued would the color have become "more red"?? How do I know what "until the color changes to red" means? To me, that is somewhat vague and absolutely relative. Maybe the degree of red doesn't matter. Maybe the pinkish/redish color I got at 13 was sufficient for the test. Could somebody please clarify?
CYA clarifiction: step 2 in the CYA instructions indicates to use the graduation closest to the fill level. Well, my fill level was lower (higher number) than the 100 graduation - I estimate it to be about 115. The graduations are in increments of 10 so if the graduations went further down the tube the next would have been 110 - which is closer to my estimate of 115. So for the purposes of PoolMath do I still use 100?
Because this is new to me I am going to re-test tomorrow to compare results. However, based on the current numbers PoolMath says to:
* add 29 oz of 31.45% muriatic acid.
* (CH) replace 50% of the water with new water.
* (CYA) replace 60% of the water with new water.
These recommendations are based on the goals of the TFP method, using bleach, for a plaster pool. Additionally, all goal values were set at the mid-point of the range. For example, if a goal has the range 30-50, I set my goal to 40. So, assuming I tested correctly and can rely on the recommendations, I assume the water needs replaced and then start testing again to stabilize the environment as opposed to honoring the current recommendation to add acid. How much water to drain - 50 or 60%?
I am shocked at the recommendation to replace so much water (though I think I had read somewhere that this has to do with TDS or some such??). All the while, my pool has never visually had a problem - it always looks fantastic. Even friends with their own pools comment how great mine looks compared to theirs'... they want to use my pool service!
Your feedback is greatly appreciated. Thank you very much for your patience.