In a standard water softener (Fleck 5600) regen cycle, what does the "Rapid Rinse" do? It comes after the Brine Rinse and before the Settle Rinse. I understand all the other cycles except this one.

We have two buildings supplied by one well. The first is a one bedroom barn apartment that my husband and I lived in for eight years - that water goes through a string filter (the small whole house ones) and the through a Kenmore softner. The barn apartment water stinks of sulphur. The new tenant can't stand it. I guess we either got used to it or it's gotten worse with the lack of rain. We (no kids just two people) eventually built the house and moved in 9 months ago. The house has a large whole house string filter and then the aeration tank and a backwashing filter. The water smells and tastes fine although we are getting light red rings in the toilets and my grout in the shower is lightly red especially where the water stands. That system was expensive, installed professionally and only seems to solve part of the problem. The company suggests we install the same system in the one person apartment ($2500) but I'm leary because how do we know it will work? Our well water test done 8 years ago: ph - 7 Iron - 2.7 Maganses - .17 Hardness - 4 The water sample taken today from unfiltered water: pH - 6.9 Iron - .5 Hardness - 4 We are planning to try to install something for the apartment and we're looking at the Pyralox. Does it work? Are there other options? We added Redout to the softner tank for the first time last weekend but I am wondering if the tank is dead anyway. We bleached the lines July 1 and installed a carbon filter - by 10 July the new tenant was very unhappy with the odor. The well was shocked 9 months ago.