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Posted By: JK

Ive never opened up a pro or csa slab, but I open sgc and psa slabs the same way - take a small, handheld trimmer (like you'd use for trimming plants or small branches) and cut off one corner of the slab (preferably up where the flip is located). Once you have removed the corner, stick in a screw driver and separate the two halves. Very easy, just be careful of flying plastic when you cut off the corner.

I use something like this:

http://www.amazon.com/Fiskars-Traditional-Power-Lever-Anvil-Pruner/dp/B000NU4YL8/