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Originally Posted by john_waggs

Few questions if you wouldn't mind answering them....

1. Does water run out of the 1/4" air line tubing when your pump turns on to refill your sump?
Float in the sump activates the dosing pump, this has an input & output- input to pickup from your RO, rotating pump squeezes the water through your tubing & into your sump as top up evap water, so thats a yes!

2.If so, is this tube inside of your supply tank, but out of the water so when it does run out of that hole it goes back into the reserve?
Im assumiing your still talking ATO here - breather holes are only nessisary when the pressure is enough to push water through the tube on its own accord (namely due to the input being close to the bottom) or the top off vessile is higher that the output.

3. How do you keep the water supply tubbing from turning or twisting, which would cause the 1/4 air line tube to not be on the bottom side of the larger tube?
super quick hit with a hair dryer - lol, i dont know, never been an issue for me!
4.With this system is it true that I could essentially have my water supply anywhere as long as i had a water supply tube and an electrical cord long enough?
technicly yes, a plenum system of pre primed water that you can tap off from or a pump that pulls dirrectly that is strong enough to draw from that distance. main problem existing with a plenum of water is countering pressure when the dosing unit isn't operating.

The plenum needs to be lower or the tap needs to be higher within safe working ranges. I'll try to explain that - think of a square container - you have drilled a hole down the bottom on one side, you have a long tube running the distance you need it to travel. You then have another box exactly the same as the first, drilled and connected the same.

basic principle here - fill one box with water & both your boxes will even out to the same level given a decent diameter connecting them. Now any variation from this simple design & you'll have to factor in pressure.

You have the standard pressure in the tube plus the pressure in the box you fill vs the box or rather the actual extraction point on the other side your tapping off. This total pressure can not exceed the dosing pumps ability to restrict it. I hope you understood that, its an easy concept thats not always easy to explain.
5. What are the pros and cons of this brand compared to what David has mentioned from Autotopoff.com?

best left to your own coutry men!

Thank you in advance.