qbquixote Posted August 29, 2022 Report Share Posted August 29, 2022 We have a little 210 gallon marquis set up now for 2 months in a 3 season room. Inline spa frog mineral, bromine and ozone. I use three step bromine with the inline frog cartridges. (though when I get through my current pack of cartridges I might start filling them with tabs those cartridges are expensive) My tests kit is a colormeteric DPD test and recommends DPD-4 for bromine. It has measured reagent on little strips. I have about 100 strips left and bought the kit before finding out about the love of Taylor titration tests on this forum. My kit DPD-4 generally tests higher than the pool store. If I use the DPD-1 chorine test strips and multiply by 2.25 it tests spot on with the pool store. I use MPS and have recently turned down the spafrog cartridge and throw in a little mps after each use. We had developed a strong "bromine smell"- posted about earlier and it has gotten a lot better targeting the lower dpd-4 number between 2 and 3 ppm. Previously I used less a lot less MPS and higher setting cartridge bromine, and did not put any oxidizer in after use -- just a couple times a week and we use the spa most days. Now the DPD-1 number is below 1 most days and I am nervous I am running the bromine too low for good santitation. I am not sure what the other oxidizers are since MPS is supposed to quickly convert my bromide bank and my ozone is runs intermittently and is supposed be gone in 30 seconds. Most threads I have found say it does not matter whether I use DPD-1 or DPD-4 since DPD-4 just measures other oxidizers too. The numbers are consistently different and I am trying to go as low as is safe to minimize smell and irritation in the tub. Any advice? Thanks Quote Link to comment Share on other sites More sharing options...
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