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I too have surprisingly low CH for where I live. Not surprisingly :) I haven't found any local stores that carry calcium chloride de-icer, but after quite a bit of searching online I came across this deal at Amazon which I just purchased.... comes out to $1.26/lb. delivered. Not bad...

OK, I'll make sure I have at least a couple undissolved crystals to ensure I've saturated. Thanks anonapersona and jblizzle.

Thanks for the all the quick replies everyone! After reading them, I think my best bet at improving the consistency of the tests is to pay more attention to the way in which I drop the testing chemicals. My drop sizes may have been different, as I was not always holding the bottle completely...

Yeah, it's a mix of white and light gray (no blue).

Hey neighbor 8-) . I don't have the SpeedStir :( . But with the powder I've been using the spoon itself to stir - am able to get most if not all of the powder dissolved (vs. swirling).

Much appreciated. Thanks for reminding me about the extended directions. I had seen these before but forgot about them. And I think both of the things you mention are good possible culprits.

Thanks for the reply. This was the first test of the morning and the pump had been running all night. Had not added chemicals since the night before. I don't think sample size is the problem, as I have a separate plastic squeeze bottle that I use for all the tests. This way I can collect...

I was in the process of shocking, using the TF-100 test kit, and started an overnight FC loss test with an initial evening reading of 15ppm using FAS/DPD. The next morning bright and early I filled up my separate sample bottle, did the test, and the FC was at 13ppm. I dumped out the tested...

Jason, Thanks for the reply and the info. I don't know that we have metals in our water, but I'm planning in using the sequestrant since it was in the instructions :) ... and I figure better safe than sorry. After reading the post by OnBalance at the first link you provided, I'm now a...

First let me say, I love this website and forum, and have learned a lot so far. I'm having my pool replastered with Stonescapes mini pebble, and have decided to start maintaining the water myself rather than dishing out the $40 a month that we used to do to the service who over-chlorinated...