Great start, gotta love a successful leak test!
ut oh...once theres water, its a domino affect now lol...
So basically a siphon on one with the second as backup?
Don't worry about a siphon forming on the backup drain in case the primary drain blocks. Provided the backup drain is the same size or larger it will be able to handle the flow. Since the backup drain would be unrestricted (no valves), a siphon would likely start and stop; noisy yes, but won't cause the tank to overflow.
Failed power off test. I hope by changing the pipes and raising the returns I will have fixed it.
The RO is filling. As of right now the tank is 2/3 full.
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I would raise it a bit. Also, Drill one or two small holes on your return lines so that it can catch air and lose siphon during a power outage. I drill two on each return just in case one gets plugged by a snail or gets covered with coraline or brown algae. Water will shoot out of the holes so drill it in a spot that won't squirt water out of your tank.
Sorry to hear that. Yea I don't use old pvc only because it's not that expensive for new ones. However, I suggest you get threaded fittings just in case you decided to reuse it on another upgrade. Seeing as to how massive your tank is, I doubt you'll be upgrading anytime soon![]()