Red Sea Reefer 525XL Version 3 Build

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How has the manifold held up? It's different than most. I have the same 525xl as you and most manifolds are from left (pump) to right (return).
 
Looks like a V3 sump. The pump is then located in the right at the back. The older version have the overflow&return pipe there.

Looks like nycfyshy has a T from the pump to the return.
The pipe going left will probably be a dead end manifold if that makes sense.
 
quick tank shot form today
 

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fleece filter addition
 

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I see you modified the ATO . I have this exact same sump except I am still using the original ATO its kind of annoying haha and not 100% reliable part of which is my fault because I don't constantly blow out the line or wiggle the float valve

Super curious to see what you did to fix this and how reliable an ATO it is
 
APEX ATO connected to a 25 gallon freshwater tank in basement via airline tubing.
Use an Avast diaphragm pump (this is super reliable and trouble free).
The fresh water tank has high/low optical sensors that activates a solenoid valve on RO/DI unit.
This part of my setup has been working well for me.
 
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