Distilled water contains no minerals, but will pick up anything in the atmosphere- C, N, P, O. You'll have to use calmag and then adjust the pH if needed, as C, N, and P can form acids in the presence of water.

Just mixing your nutes won't re-dissolve insoluble salts.

You should be using hardwater formulas if your water is that hard. Your background ppm is outrageous; check the GH hardwater formula or the Canna one shown here:
Canna Hydro Vega 1Ltr Hard Water / Canna Fertilisers / Two part nutrients / AquaCulture Hydroponics
*I've never ordered from that site; link is for the product description*
stinkyattic Reviewed by stinkyattic on . Lockout- Hard water, rain water, choices! OK I'm officially back and man do I need help! We moved last year and ran into so many problems with my new setup but ironed most of the kinks out. As usual with a new setup and strain there is a learning curve as you relize mistakes and stabilize the problem. I have narrowed it down and have discoved it to be the water. So I'll tell you everything I know about my water source. It's well water, we live near a large lake that isn't the healthiest, but not biohazardous yet. The pH is at Rating: 5