You must go through so much ph up.
My tap is 9.2 with 0-10ppm, straight from tap, no RO.
When I add all my nutes for feeding my ph is at roughly 5.6.
9.2 to 5.6 is a huge jump. I would assume your ph is around 4.1 when you mix all your nutes together.
When you get low ppm water, pH’ing isn’t going to tell you anything useful.
That’s because there is no buffer. You can see this effect if you add a drop of pH (up or down) and check it again. (big swings compared to regular water).
Granted, for hydro you still might need to fiddle with it once nutes are mixed.
Cheers
G
I actually haven’t been using any. I top dress organics and water with recharge every other watering
that would do it 
My dehumidifier produces water at a PH in the low 4’s… my tap is 7.10…so I use tap.I drop er down with some ph down after water has sat for 24hrs. I keep a small pump circulating water… and use that to water house plants and what not…
I dont use any liquid or powdered ferts though…
Just some simple 444 and 286 mixed in the soil with wormcastings. Just add good water!
Ph run off is around 6.2-6.5