Fishy!'s Long and Low 60ish Gallon

[Fishy!]

Well I picked up a Rodi unit today from a local reefer who shut his tank down. I am very happy not to have to lug water from the grocery store anymore!



It came with a tds meter. I have had a few tufts of hair alge popping up in my display and what looked like detritus on my sand bed I have been trying to vacuum out every water change. I cut back feedings and upped water changes to no avail, and started to suspect the source water a month or so ago. Tonight armed with the new tds meter I took a reading on the bottled water I have been using. This is what I found:



I am fairly certain that this might be the cause of my struggles with the blooms of algae. I feel like when you are running your water through an Rodi unit and coming out with 0ppm that 76 is quite high. Am I wrong?
I unfortunately have to work tomorrow (these 60 hour weeks really eat into Reefing time lol) so I likely won't get the unit online until Sunday. If I am coming out with 0ppm out of the unit I think I might just dump the 10gals of mixed water I have on hand for my next water change and make new. Would you, if you knew it was mixed with 76ppm water??