I've lived in this house for 17 years, and kept multiple tanks the whole time. I have a well system with water softner. I've literally had fish live in this water for years before trading them off (fresh, brackish AND saltwater reefs). Blanket statements that water softners are not good for fish are simply not true.
Purchasing this property in 1986 it included a whole house Kinetico salt regen water softener (not a cheap system). That system was upgraded in 2006. Never had fish that didn't come from a store here until I started using an alternate source for water and then adding the RO system I now use. Fish now spawn constantly in my systems and rather than store bought fish I'm selling fish and mulching tank trimmings.
My blanket statement is that my water softener was not good for fish or plants.
Funny or not is what it is.
I live in west central Florida with tannin lakes and wetlands all around my property.
Well water leaves iron colored stains on everything, the electromagnetic sprinkler valves stick and the head nozzles plug once a year at a minimum. The water spots heavy deposits as it dries. Basically water from hell. Well water drawn into an open bucket with a sponge filter/aerator running for 2hrs. reads as follows;
Ph 7.2
kh 196.9 ppm
gh 179 ppm
phosphate 1.0
iron (off the scale)
Nitrate, Nitrite, Ammonia 0.0
Water ran through my Kinetico RO system (uses salt for regen)
Ph 7.0
kh 196.9
gh 35.8
phosphate .75
Nitrate, Nitrite, Ammonia 0.0
The following were tested at my work location water lab.
Temperature 25°c
pH 7.56
hardness 10 ppm
iron 0 < .1 ppm
Maximum Turbidity 1.0 NTU
Maximum Chlorine .02 not visible
While the numbers don’t look completely wacked the well sample sponge was packed with orange ‘dust’ when squeezed. Fish had a Russian Roulette chance when purchased. Plants just shrank and withered out even the ones from the local swamp. Did a test using distilled water 100%. RO Right and Seachem products to remix. Fish losses went way down, almost nonexistent but water changes were a transportation pain and getting ever more costly with distilled rising at that time to .94 per gallon. Maintaining ferts and doing weekly 50% water changes mandated a change.
Whether it's sodium chloride or potassium chloride once you chemically break the bond shifting the mineral content stripping the Calcium and Magnesium the water is messed up. The altered water won't have a mineral balance the fish and plants need to thrive. Played this game here and have now chosen to play mad chemist with 100% RO instead.
I'll stand by what I've posted.