I too have "tried" the Pool Frog. Last year was my first year as a pool owner and this was the system they set up for the pool. It never kept the pool from going green! (Not in the good sense, either) I still have it attached, but I don't have a cartridge in it and it is set to max flow (10). I have good pressure. I have used the BBB method to transform my "pea soup" into a very pretty pool. However, I was gone for one day and it turned green and cloudy and I haven't been able to get it back. So, I broke down and went to the pool store to see what was going on with my water. These are the numbers the computer water analysis printed out. I don't have a test kit yet, I was trying to go by the test strips first just to try the method out.
CYA: 42 (bought and applied 1.75 pounds by store request!) (so may be 55 by end of next week)
TA: 228 (Bought store brand dry acid 8lbs to apply over next four days) (I have applied some of it today)
Not a Salt Water pool
This is my first post, so if you need any other information, please let me know.