That's great if you still have 0 CYA from the fill. How many pucks were used ? Each 8oz tab raised CYA 2.2.
I put 3 pucks in to start and just added 3 more yesterday. I pulled the pucks out this morning and I took the weight of each this afternoon and compared to a new puck. In short, I used about 2.1 pucks, so based on your comment I was probably at something like 4.5ppm.
Yup. Carrot on a stick like. Some time later, or even tomorrow it will be mush and squeeze right out. Careful to squeeze it through the sock and not out the top.
I started to squeeze some out about a 1.5 hours later. I wasn't sure what to expect, but it turned to mush and squeezing it really created some CYA clouds! Check out the video.
Based on what you described this seems exactly what I should expect. Does it matter how much comes out as long as its suspended in the water and not granules? Can I just keep squeezing? Got pretty cloudy so I did a little, paused for a few minutes, swirled the silt net around in the water, put the squeeze on, and took that same approach a few times. I read somewhere that CYA can discolor the plaster. While I think that was related more towards casting it in the pool and it sitting on the bottom, I didn't want to just squeeze like a mad man.
Minimum FC + recent daily loss + 2 insurance FC = stupid clear water. It's a moving target throughout the season. More more more more, midpoint of the season, less less less less. Think of a bell curve for loss.
Simple easy way to think about it. Thanks for that.
You only added a little. You stopped because you never want to add any, not because 3 pucks would hurt you.
I actually started down the rabbit hole to try to calculate copper ppm based on puck usage. Based on the MSDS sheet for the tabs, at most the "other ingredients" (which aren't identified) is just under 5%. With using about 2 tabs I guessed at most there could be 0.87oz of copper sulfate. If my calculation is correct (mg/L) that gives me a max of 0.43 ppm. I'm guessing actual amount of copper sulfate is much less.
I read the copper wiki:
www.troublefreepool.com
It made me wonder if I should do anything else but since my calculated max copper is under 0.5 ppm the wiki says:
"In general, less than 0.5 ppm copper will likely not have much effect on pool water. 0.3 ppm is even safer. Over 0.5 ppm you may have some staining or water discoloration, depending on pH.[1]"
This got me thinking about sequestrant and how often that should be added. Since I added some during and when finished filling I wasn't going to dig into this for a little while.
Once the CYA is suspended in front of a return, dose chlorine like the CYA is already dissolved.
If adding CYA to get to 30, add chlorine to get to 6. Never let the FC get below 2 with CYA of 30 - better the FC be a little high than to flirt with it falling below minimum.
Done. I'm still getting accustomed to reading the comparator but I know I'm above 2. Hard for me to tell, but maybe even above 5. While the picture doesn't seem to show the differences well between 2,3, and 5, what do the experienced eyes say?
On another note, it looks like my pH might be 7.4 if I am reading it correct (any other opinions?). To me it seems more peachish than pinkish. At 7.4 it flipped my CSI to negative at -0.14. I took this sample about 2 hours after starting to add the CYA. I read somewhere that CYA will drop pH. I went back into pool math to check affect of adding chemicals and adding 4lbs of CYA could lower pH by 0.7 and TA by 12.0. I should have understood this before adding the muriatic acid earlier, they are both acid which will reduce pH.
Oh well lesson learned, hope I don't go stupid and forget it. It will be interesting to test tomorrow and see where I'm at for FC, pH, and TA.
