water wash , bucket wash, new terms for the old guy. After 35 years running pumps I just suck back a hard ball , wash out the hopper , and forget about it until the next pour.

bags or ball , bucket of water , ball again, dump and wash  - no worries.   (but the rest is interesting to see!.)

Bag’s, Balls, Buckets or Water washing, The factory will teach to suck a ball that’s in good shape SLOWLY!!!!!!!!! This has proven the most reliable around the world with all kinds of mud. But lots of years have taught me there are lots of ways to the same end. End of the day. Its how are you doing in the morning that’s important, If you are priming reliably next pour you did good on the clean out, if you are building up or plugging up its time to try another method.

8X8 sponge slowly works every time never jammed on a prime out of the boom in 7 yrs. stick with what works.

cup where you gettin sponges, con forms only sells the orange balls and i miss my old 8x8 squares

rick5z straight from putzmeister brotha

or try this site http://www.concretesqueezepumps.com/