SMaguire19 Posted August 14, 2021 Report Share Posted August 14, 2021 I'm not new to working with a hot tub, but I'm running into issues that I can't get my head around. Background....400 gal. outdoor hot tub (hotel), bromine sanitizer, 250 lb. sand filter. Lately, our hot tub has been green-ish, which to me is a sign of lower bromine, but the levels have been good. In fact all the levels have been on the low side of good. The water color is a greenish-yellow, but very clear. In past weeks we have drained the tub and started from scratch, with similar results. The only thing I haven't done is change the sand in the filter, but that was done not that long ago. Also, what is the role of calcium hardness in the chemistry end of things? The levels for that never rise to where it should when we add the proportionate anount of CH increaser. These are probably noob-ish questions, but any help would be appreciated. Quote Link to comment Share on other sites More sharing options...
RDspaguy Posted August 15, 2021 Report Share Posted August 15, 2021 Does the pool have any issues? Is the spa on an inline feeder or chemical automation? Detail your maintenance routine, chemicals used, and method of testing. Also a complete set of test results. @waterbear, any thoughts? Quote Link to comment Share on other sites More sharing options...
waterbear Posted August 21, 2021 Report Share Posted August 21, 2021 I have a few ideas as to what might be happening but first post a full set of test results and how they were obtained (strips either read against a color chart or in a machine, drop based kit with liquid reagents, dealer/pool store testing with a meter, etc) and we can take it from there. Quote Link to comment Share on other sites More sharing options...
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