The Planted Tank Forum - View Single Post - Whole House Water Softeners
View Single Post
post #15 of (permalink) Old 06-12-2019, 07:13 AM
Carpe Diem
OVT's Avatar
PTrader: (144/100%)
Join Date: Nov 2011
Location: NorCal
Posts: 7,355
The key is the difference in gH between pre- and post- treated water. To calculate the amount of sodium / potassium added by the water softener based on the gH drop: How Much Sodium Does a Water Softener Put into Your Water? ?[censored]Pure Water Products, LLC .

In my case, a 4 degree drop (from 8 to 4 gH) was adding too much P and we turned the softener off via a by-pass valve.

Another consideration is that the efficiency degrades over time due to the removable and coated resin satturation. The removable resin can be replaced yearly (~$80). Re-coating the tank is a much more expensive proposition. If your system is rated at 4,000 gl per cycle new (before back flash), you need to re-coat when the system degrades to 2,000 gl per cycle. The side affect is that the amount of salt / potassium added to the tank decreases and the residual Ca and Mg increases over time.
OVT is online now  
For the best viewing experience please update your browser to Google Chrome