If you DO have to unblock it, be very, very careful and unblock it from the outlet side, not the inlet side. If you get sucked into the pipe, or part of your body gets sucked into the pipe from the inlet side, it could get very messy very quickly..

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).