Greetings from New Mexico! This is my first post here so I figured I would go ahead and jump right in and get to the juicy bits of my recent discovery. I will begin the problem, hard
water and dead soil. Sure you could use an RO/DI filter to remove all the dissolved solids from the water but the problem of waste water would remain.
My only prior
experience with water parameter management has been with salt water/marine fish tanks using live rock to filter the water. Live rock is limestone with tons of biological life in and on it that
feed on nutrients in the water column. Using this technique has allowed me to forgo water changes completely for the past 5 years! This background in marine husbandry I believe is what lead me to my little breakthrough for hard water. In simple terms the filter consists of a worm bed which drains into a reservoir outfitted with an air pump/stones and a small return pump to send the reservoir water back to the worm bed to complete the circuit. I've been running a small system (two 5 gal buckets) for a few weeks now and the worms are thriving along with the plants.
I don't know what is happening biological but I would wager that the ionized calcium/mag is transformed into crystalline clay through the biological activity. Best part is the water stays at a rock solid pH of 6.8
I'll do my best to keep everyone posted on this as it develops