Does anyone on here have any experience with Vers-Lok square foot. This is the first time we have used it and found that the groove on the pin system get filled with stone from back filling the core and drain column. it took forever with a screw driver on the first course to remove all of the stones out of the groove. on the second course i took a 3/8" air line and pushed it into the groove to keep the stones out, but this is a pain in the a$$. Just wondering if anyone has a better way of doing this. seems like a dumb system to me, maybe thats why it so much cheaper?