Sorry, but have to say, I watched the entire vid only to see tanks at the end that looked as though they had pea soup in them!!
I have run a drip for 5 years and don't regulate mains water into the pods. I only regulate with the tap shown in the vid but I have this tap on the exit side of my pods. I use this tap to allow more fresh water into the system in the summer months and less in the winter. I use a normally closed solenoid valve on the incoming water which is linked to a timer so the system comes on for a few hours in the morning and then again for a few hours in the afternoon. So I don't run a continuous drip, more of a full flow but twice a day. My only worry with this is the temp drop around 2 degrees (less in summer) each time and the heaters probably have to work hard to reheat the water.
Maybe I should go to a continuous drip but the point of the normally closed solenoid valve is that water will not come on in the event of a power cut.
I run this on two large ray tanks and has always worked for me. Just change the filters in the pods every 3 months.
I have never done a manual water change.