I want to run a pipe from an electric pump which will take parlour washings around to regularly flush through some slurry channels. We use the same pump to run the dirty water to a couple of flexible hydrants/ guns to wash down our collecting yard. The new pipe work will help us to regulate the volume in our storage tank as well as keeping the channels flowing. My question is can I use some old Bayer aluminum irrigation pipes? I have a pile just sitting in some nettles and I would have thought they would be ok and it would save a £1000 or so in 4" plastic pipe. Am I setting myself up for a problem?