Fertilizer dilemma

[GoldStar135]

Hi everyone-
I have a little problem regarding fertilizer. My house uses water from a well, and therefore our water system relies on a water softener. I've been using the outdoor faucets because they bypass the softener, but however recently I found out that the water coming from the faucet is around 600ppm. With fertilizer (Miracle Gro orchid food) it's around 700ppm. Am I right in assuming that that amount is way too high for orchids? I have been seeing salt burns in the velamen of my phals.
I do have an RO system installed (9ppm), but I've hesitated in using it with my current fertilizer after learning that using fertilizer likely intended for tap water mixed with RO water could result in pH problems. I'm thinking of getting MSU fert for RO water, but that'll leave a bag of fertilizer left to waste. Is there any way I can make use of the unused fertilizer?