Dosn't it have alot to do with Alkalinity as well? If you have a high alkalinity, your pH won't have the ability to lower itself as easily?
I don't know if HarleyK agrees with me, but isn't the best way to create soft water and keep it stable is by actually stripping the water of its hardness, with an RO unit. Then afterwards, buffer your alkalinity in some way so that your pH does not go crashing through the floor.?
I have a dehumidifier in the fish room that drips out 'pure' water with 0 hardness and is incredibely soft. This works for me much better than an RO unit. I have it drip through a series of carbon resins and other purifiers, before re-cycling itself back into the main system.
I don't know if HarleyK agrees with me, but isn't the best way to create soft water and keep it stable is by actually stripping the water of its hardness, with an RO unit. Then afterwards, buffer your alkalinity in some way so that your pH does not go crashing through the floor.?
I have a dehumidifier in the fish room that drips out 'pure' water with 0 hardness and is incredibely soft. This works for me much better than an RO unit. I have it drip through a series of carbon resins and other purifiers, before re-cycling itself back into the main system.