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That grey hose barb is 1" ID that had to be shaved down a little so the tube I used (hate it) would slide on easy----then clamped.
Tapped a 1" hole for that fitting.
The other fitting is for the supply line going to the spray line------used a 3/4" tap.
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End view-----notice the supply line in front of the drain-----helps prevent roots getting in drain (rarely happened).
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Here we go with the manifold:
Notice the valves for all the supply and drain lines -----made my life easier several times.
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I used a 100 gallon Rubbermade livestock tank for my rez ( filled with 70 gallons max)----great product-----very strong and easy to work with.
If you notice how the drain goes back into the rez----that sets the minimum height of the tubes from the floor.
To drain the nutes I attach a water hose to the top position on the pump manifold and turn the valve on (I love quick connects).
The pump is a 3/4 hp high head pressure version that is on of 15 seconds and off 15 minutes. The reason for this timing is power draw (~1000 watts) and it gives the nutes more time to be cooled with the chiller (1/4 hp).
The same pump supplies both the veg and flower tubes----if you look closely there is a 2" pvc pipe coming through the wall and into the rez----coming from flower room.
Another trick that I really liked----When the nutes are being flushed down that washing machine drain pipe---I remove a filter in the rez and attach a hose that acts like a vacum to get all the "stuff" out of the rez.