Hello everyone. I've been stalking this site for a little while and you guys put out some really good information.
I manage a seasonal beach club business in New Jersey with two pools (100,000 and 5,000 gallons respectively) that see pretty heavy use. Unfortunately I also have about 14-16 high school and college aged guards doing hourly FC TC pH tests for me. Earlier in the summer after double checking some questionable readings with our standard Taylor kit I wanted to try and take the subjectivity out of the results (obviously I, as our CPO, am modifying chemical distribution based on those readings). What looks like a FC 2 to one person is apparently a 4-5 to another. Anyway we invested in a Lamotte Colorq Pro 7-Plus. After a brief show and tell with the guards for proper operation we were off and running. Things seemed rather normal at first. Then a week later there would be multiple times we would get a crazy difference in both FC and PH in an hour's time (and I'm talking like 4.6 FC to 1.4 or just this morning we had a PH from 7.6 to a 7.0 in the big pool with little use). I compared a Lamotte reading with a Taylor reading (one right after the other) this morning and the results were -
Lamotte - FC 1.44 <did this twice and readings were similar>
Taylor - FC 5
All of the reagents are new and the batteries are brand new in the Lamotte kit. Does anyone have this kit or know of any problems with it? As of now it's shelved in favor of the old drops and color chart until I can figure out what's going on. It makes sense that the Lamotte kit is off because we use an automatic sodium hypochrlorite chrlorinator in the big pool and the pH readings are never such that I've had to add much of any muriatic acid this summer (which is unusual). Of course, then the taylor kit indicates pH is running high, which makes sense. Any help, insight or advice would greatly be appreciated.