One of the things I learned today...yes, I learned more than one thing....is that the only reason some PVC primers are colored purple is so a building inspector can see that the plumbing has been installed with the cement and the primer. When the inspector sees the purple smeared on the pipe, they know primer has been used.
Soooo, if you don't plan on having your aquarium plumbing inspected, or don't have to, then the clear primer is the way to go, thus avoiding the ugly purple smears!
Cheers,
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Mark.
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