Yesterday, I stopped at Costco looking for an umbrella for the deck table. As I am a big fan and believer of the TFP method, I decided to check out the swimming pool section and saw 40 lbs. of 3" pucks. What I saw was real strange. The instructions indicated that placing a certain amount of 3" tablets in the pool will raise your ppm level from 1-4 ppm, something to this effect.
Then it went on stating to keep adding tablets until you reach 4 ppm. Then there was a disclaimer stating that anything over 4 ppm is "not suitable" for swimming, not exactly in these words. For the average person, they place pucks in the pool, skimmer, etc. and forget about everything until they develop algae.
The phone # was an 800 # with SOS-SWIM afterwards. First and foremost, how can anyone ever figure out without the proper test kit what the true level is? We all would be sick if this was the case. There was also the word "blue" somewhere in the label. I was in a hurry so did not write the name down or take a picture, in which I should have.
While on the subject, I read that "glue" holds the CYA and chlorine together in 3" pucks. Any validity to this?