If you "T" off the intake of your closed loop then each end of the "T" will have less preasure draw. His will help with the sand issue. It's not pretty but it works. Also I had Paul @ OM mod my drum so that the drum was full width on the edges but in the middle it is about 2mm narrower. this way sand passes freely through the unit. I havn't needed to pull my OM 4-way appart in 8 or 9 months.
J
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