Distilled water change out and poms

Im in my 5th week of veg. I started out using tap water but the ppms were close to 500 so i switched to distilled water. My ph stays around 5.5 from the start never go over 5.8. My ppms stay around 1250-1300. My plants drink about gal of water every 3 days and i add back distilled water. The water looks clean other than the color from the nutes. I have been changing out every 10 days. Should i change out my water sooner like 7 days or go even longer since it looks clean? I also would think my ppms would drop more but seem to stay about the same as the first day of change out! Any opinions would be greatful!

Pictures would be helpful, but a change isn’t necessary any sooner. @SubB

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Not all your pictures loaded, but they look good. Just keep on keeping on.