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Snails know best!


Snails know where to go to get water – inside slotted pipe!


Our tank tests have shown that some 22 mm of water remains inside a slotted pipe when it stops draining.  We needn’t have taken such precise measurements, however, because we only need observe the snails entering the slotted pipe to get at the water.            


It is not just snails that go after this residual water.  Tree roots do too.




No wonder slotted pipe blocks after a few years!