After finding TFP we learned that our 1st step towards a TFP would be a drain and fill to reduce CYA level of 160.
We are nearing the end of the drain and fill and our estimate based on using the Pool Fill Dilution Calculator and backing in to numbers using the Pool Calculator is that the CYA will be in the 60 to 70 range once the fill is completed. We are completing the last of the fill with a hose (well water, no metal issues). Right now we can NOT run pump since the water is not high enough yet. Should be there late today or tomorrow morning.
In the meantime we have been doing the "witch's cauldron" (read that from another poster and it's funny) method of water mixing - running a submersible pump back into the pool and lots of brushing.
We have a TF-100 kit and will be running a full set of numbers tomorrow once we can run the pump.
I did a diluted FAS/DPD test (to save on reagents) on the left over pool water after the drain (FC 5) and also tested the fill water that was delivered (FC 3.75). (Diluted test = 10ml water sample + 15 ml filtered water mixed, use 10ml of mixed water sample and multiply each drop by 1.25)
I used the Taylor K-1000 to test pH and both were at 8.
During the fill I did add some 8.25% bleach. Right now the FC is too high to accurately test pH. I'm using the K-1000 to get an idea of where the FC levels are at since 1) we'll need FAS/DPD for upcoming SLAM 2) since pump is not running the water isn't thoroughly mixed 3) Since we're not swimming or SLAMming accuracy doesn't seem critical. Based on the colors from these tests I would guesstimate we got the FC up to about 15 yesterday evening and it is down to about 10 this morning.
This is based on JasonLion post - "The OTO test is normally used to measure TC levels between 0 and 5. You can, however, use this test to get a vague idea of extremely high TC levels. If the sample turns a particularly vivid yellow the TC level is between 5 and 15, light orange is between 10 and 20, dark orange is between 15 and 30, and brown is 30 or higher."
As expected we are loosing FC to algae.
All this to get to my question (thanks for hanging in there) - should we let the FC drift down so we can accurately measure and adjust pH before the SLAM or should we just start the SLAM once we have enough water to run the pump?