I used to use a 5 micron, 5 gpm whirlpool filter in the second stage (with an RS6 filter, 30 micron, 10 gpm in the first stage) to get "small" things". ", and this filter filtered out smells (kinda) better. However, this RS16 unit filters down to 1 micron and lets through twice the volume of this hot tub; this thing definitely lets 10 GPM (at water pressure) through. 60 psi) It delivers crystal clear water that is almost entirely free of rust (so a water softener shouldn't do that [with all the attendant softener corrosion issues]). I think it's capable of filtering down to 1 micron at this high flow rate due to the huge surface area including the top and bottom which are unsealed. With our use, it lasts a full six months, although I think after about four it becomes less effective. One caveat: It's too dense for a successful presoak, so there's a lot of air in the medium, which is displaced by the first few tens of liters of water it filters WILL "carbonate," downright foamy with dissolved air, that comes out of the tap comes. A glass of water is a bit unusual but perfectly safe; it's just air. Take a shower or two and it will go away.
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