What Steve said. You really can't wet it. It is so porous that liquid just drains through it. When you need more, go to www.excellent-supply.com. For super-bad commercial carpet, it's also good to have one of their FiberMax pads on hand. Those are the gray ones.
I had to use a FP pad on a real nasty job today.Low cut Berber with nasty pet stains. I tried just a coton pad at first but I was not satisfied with the results. I resprayed the entire room with Vac away Itensity green boosted with spot and boost. I scrubbed and the nasty stains seemed to melt away I repadded with cottons and the carpet looked darn near new