I bought a new Sundance Altamar a couple of months ago, and set it up for Bromine. I test every 2 days with the Color Q Pro7 kit, and keep all my water within the recommended limits. The problem I have is when I remove the Micro Clean Plus filter cartridge (every 2 or 3 weeks) and wash it out, then re-install it. The next day the Bromine level drops to .2 or .3 and the spa water is cloudy. I keep 2 to 3 Bromine tabs in the Weir door, shock each week, and keep the PH and ALK in perfect balance. It takes several days to get my Bromine level back to 2-4 PPM, and the water to clear up again.

I feel like the filter material must absorb and hold the Bromine, and washing it takes all this out. I did this over the weekend, and then added a "ground up" bromine tablet, which seems to get the Bromine level back to 6 pretty quickly. Then the tabs in the feeder slowly took over and now I am back to 3-4 PPM. The tub also has the deluxe Sundance Ozone system installed.

Would I be better off changing the filter over to the earlier model Sundance Filter (6540-488), and keep 2 on hand (one in tub & clean one on shelf) and rotate them every month? Would this filter be better at not retaining the Bromine verses the Micro Clean Plus unit?

I just don't like the fact that I have a perfectly balanced tub for a couple of weeks, then loose all my disenfectant when I wash the filter...and have to work to get my Bromine back to normal. This is a pain, and I think it is all due to the new filter cartridge material. Other than this, I am really enjoying this tub and the theraputic attributes.

The MicroClean Filters are designed so that you do not need to take out the filter and rinse it. That's part of the sales pitch - that you can leave the filter in it for up to 9-12 months, only taking it out after it has started to "collapse"

Hope this helps.