It will take minerals out of the water if the minerals have percipitated out of the water.
When you first fill your spa, most of the minerals are in a solution form. They cannot be filter when filling the spa except with a very fine cartridge, much like a softening cartridge. The water will appear clear when you first fill the spa with a heavy amount of minerals.
When you add an oxidzer, such as mps, chlorine, ozone, etc..., then the minerals are oxidized out of solution. This is why it might take a day or two to turn a fresh batch of water green, or also why a brown rust appears at the outlet of the ozone jet.
When the mineralas are oxidized out of solution, then your pleated filter can pick them up, which is why a filter will turn brown a few days after filling the spa.
At this point, you can use clarifier like Super Blue to stick all those minerals together and bring them to the surface.
We had a customer that had their water turn green and I suggested using Super Blue. When they put it in, the normal foaming occured with what looked like sand on top of the foam.
And tony is right about using the clarifier sparingly. If you have to use it on a regular basis, there if probably another issue that needs to be dealt with.
