Are you sure it's bad water? My tap water is ~200 ppm but it's one of the highest qualities in the world. It just contains a bit more calcium, magnesium and other elements. You may be able to get an analysis from whoever provides your water. Granted, if you can go below 100ppm that would be great of course.
For me, I can actually use less nutrients because the water already has a lot in it :) and the water is really cheap. Your plant looks very healthy.
By the way, I see that you are using organic nutrients. These are slow-release, and are converted to usable nutrients at the root zone. With organics, PH-ing is Not an issue as plants actually make the soil around the roots alkaline or acid themselves. With the help of living things in the soil. (bacteria, fungi). Adding PH minus (often phosphoric acid) quickly decimates this microbial life in the soil and will harm the plant. (PK13/14 fertilizer is also known to kill soil life)
I can't re-tell the story in 100% detail, but it came from a Plagron representative: With organic growing, monitoring PH is not necessary if you are using good soil and good nutrients. :) The beauty and health of your plant seems to agree.
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