Does anyone have a tip for keeping consistent with the DPD 870 'heaping scoop'? I'm fanatical about cylinder measurements and repeat a test if I lost count of drops. I try to be just as consistent with the DPD scoop, but even swirling to dissolve all the powder/crystals I've noticed no or various pink shades, sometimes with close to same FC, sometimes not.
Yesterday afternoon my FC was @ 2.5, sun was on the pool. Despite recommendations I mentioned earlier by the pool store of super shocking with 3 cases overnight, and it being something I've opened with and then switched back to Baqua in the past, I didn't want to add that much. At 8pm I added just one case. Calculator prediction was FC 40. I got 40.5.
At 9:23pm FC=36. I have been losing chlorine during the night so while I thought that was a lot after dark in one hour, I decided to leave it and see where it was in the morning.
At 6:45am FC= 52.5 - WOW, it cannot go up, so I retested thinking maybe my DPD scoop was too big, so I intentionally made my heaping scoop smaller than usual and got FC=38. That's still higher than my 9:23pm test of FC 36.
I tested again with the same sample of water using what I think is about the same size scoop as I normally do and got FC=40. That would say I didn't loose chlorine overnight, but of course that isn't right either, because I have been loosing quite a bit. So, my scoop size was off?
Results of a fresh sample and test at 8:50am with my 'usual' heaping scoop size:
FC 26.5
CC .5
Hence my question about consistent scoop size....Curious to know if others have mastered that. Which, being me, leads to another question..."why not a level scoop?"