Susanj Posted March 29, 2023 Report Share Posted March 29, 2023 Can someone figure this out for me? The hot tub in our vacation rental had no use for 2 weeks ( place was empty) . When I got here , the Frog chlorine cartridge was empty , yet the reading was very high- 10 ppm. Quote Link to comment Share on other sites More sharing options...
Cusser Posted March 30, 2023 Report Share Posted March 30, 2023 No users, covered all that time, all the cartridges dissolved over time, could happen. 1 Quote Link to comment Share on other sites More sharing options...
cranbiz Posted March 30, 2023 Report Share Posted March 30, 2023 Frog works differently than traditional chlorine. It builds up a high CC count which it then draws from over time. Drop kits can falsely indicate readings because of this. The strips (which I know, strips suck) are a better indicator of safe chlorine levels. That being said, I still use a drop kit with mine and only use the strips when things look out of whack, which isn't very often. Quote Link to comment Share on other sites More sharing options...
Susanj Posted March 30, 2023 Author Report Share Posted March 30, 2023 I do sometimes check it against the test strips, and in this case it agreed. I use the Frog brand test strips. Not sure that it’s necessary, but they say that a hot tub using the Frog products does not test the same way as a hot tub using Dichlor .” Other test strips may tell you that your free chlorine level is low and your spa has a high total chlorine level which normally means it’s time to shock . This can be confusing because the Frog system uses a chlorine reserve to pull chlorine from when it needs to , over a 2-4 week period, so a high total chlorine is completely normal, and does not require a shock to be used . Frog test strips do not measure free chlorine. Why ? because the free chlorine remains consistently at .5 to 1.0 so there is no need to test.” ( I still do). It creates a reserve that converts to free chlorine when it senses a demand - it is self-regulating . The reserve will start high and slowly deplete over the life of the cartridge as it converts to free chlorine when needed.” Quote Link to comment Share on other sites More sharing options...
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