[Resolved] Auto Pot Water Usage

hello, I am using the 47ltr water bin and x 2 15ltr autopots, the newer model with the double tray system and matrix discs that sit over the bottom of the pots, how often should I be refilling my 47ltr tank is its barely dropped, water is refilling inside the valve section but not very often, it doesn’t seem to be using much water but my plants look healthy and great im using Sohum living soils and PHd my water at 6.0-6.5