All the primer does is soften the PVC a little so when the glue bonds ot makes a better seal..
I used to install underground irragation at the local college The primer is meant for systems under pressure.
Still it does not hurt to use it.. I have used the primer here as I know the joints will be perfectly sealed.
Jim
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 3x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, Blue LEDs) Vertex Calcium Reactor 2x Deltec Pellet Reactors
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