What is the best type of water to start with?

Just wanna make sure about something, since I haven't seen a lot posted in regards to soiless mixes and PPM's

I'll be using tap water, which is about 8.01PH and 220PPM. I let it sit in 5 gallon buckets for a couple days with an aeration stone in it, then I transfer to 1 gal buckets for the feeding. In the 1 gal buckets I add my nutes, let them settle for a bit then use white vinegar to get my PH down to the 5.7-5.9 range, iirc the PPM after I add the nutes in this stage(seedling) is around 350

The medium is 50% peat moss, 25%V, 25%P. I haven't seen a lot posted about the PPM, I assume as the stages go up and I'm adding more nutes the PPM will rise as well, will this be a problem for me? Or are my PPMs for this medium in acceptable ranges?
 
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