Hello everyone. I've been reading for a while (thanks to all that contribute here!) and wanted to ask some specific questions that weren't clear to me after searching through some of the other posts.
First some details about my set up:
Bought a house with 26K gallon in-ground plaster salt water pool last year. The filtering system uses DE. Being that I was (am) new at this, I elected to have a service come by every two weeks during the first season to make sure that everything was kept up. At the same time, I made a commitment to take over more of the day to day aspect begining with the second season (this year). So, I elected to have the service do the opening and closing along with a monthly schedule and hand-holding along the way if things got out of hand in between. My ultimate goal is to be able to do it all on my own.
On to the questions:
I inherited a LaMotte ColorQ tablet based kit with the house. I didn't use it at all last year, but with getting more involved this year, I've started to use it a lot more. Problem is that, after reading about the different test kits on this board and getting the FAS/DPD kit as an alternate testing method, I'm getting some wildly different results from the LaMotte than I'm getting while using the FAS/DPD at times.
Here is an exanple from today:
FC - 1.32 (LM) 5.0 (FAS)
TC - 3.76 (LM) 5.0 (FAS)
What compounds my reliability of the LM kit is that the pool service also uses a ColorQ kit (drop based) and we've done a side by side with the same water sample about 3 weeks ago and gotten some very different results.
So, the question is, which do I rely on? Given the result from the LM, I should be concerned about the CC level...but the FAS test stays clear after adding the second reagent. The FAS test does introduce some level of user error - for example, how much does the actual scoop size come into play? I've read that adding the first reagent is kind of time sensitive...maybe I'm not doing it fast enough (or too slow)?
Next questions have to do with adding liquid stabilizer:
Currently (according to 2 different test methods) I'm at 50ppm CYA. Trying to get to the 60-80 range recommended both by this site and the SWG manufacturer. I'm using liquid stabilizer simply from a convenience standpoint. Problem is though that I added a gallon when I was at 42 and after a few days and testing again, I'm only at 50. Just wondering why it didn't go higher? I've noticed that if I add it directly to the skimmer, it tends to bump up the pressure on the DE filter. So, I'm wondering if I should be diluting it first? Should I just add it to the pool water directly and forego the skimmer?