Simple HD bucket rig

auto shutoff valve

 
auto shutoff valve

Automatic Shut off Valve Quick Connect 1/4" Inch Fittings for Water Filters / Reverse Osmosis RO Systems by Ronaqua https://smile.amazon.com/dp/B07D97BRWC/ref=cm_sw_r_cp_api_glt_i_5XF0KZ8PTWYN1YNQXG42


thank you so much!

this is the same thing, right?
 
Great idea! I just set a timer and, crucially, my RO bucket is in my downstairs utility shower so no harm if it overflows. But I like this ASO addition for automating things and not wasting water.
 
Pricier but worth it

tied into a controller to power it on and off, you can have it auto fill your RO/DI at a regular interval. Optical sensor has no moving parts to fail (except if you manage to knock the magnet outside your container off).
 
After the prefilters but before the membrane. Side 1 and 2 on switch. Product of membrane but before the DI unit side 3 and 4 on switch. Pressure builds on side 3-4 and flips a diaphragm closing side 1-2 shutting off flow to the membrane. Pressure drops diaphragm flips open and it fills. Same kit that a drinking unit uses
 
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