tank remodeling,sump question? (last page)

[The Codfather]

Originally Posted by jjntm

I am a plumber... and I can tell you that primer is only meant to clean the pipe before applying the cement... It is not needed under such low pressure systems like our aquariums.

Sorry Elias, if I'm hijacking your thread. But I do not agree with this statement (this is my own personal and profesional opinion). A primer is needed for several reasons, it dissolves the wax layer that is formed in the extrusion process, it also softens the piping allowing for better bonding and penetration of the solvent weld. Read any manufactures specifications and they will tell you that in most pressure applications, a primer must be used. They even recommend it with there one step for DWV systems.