My knowledge of bores and pumps is fairly limited. I have a small hobby farm and I use a shallow jet pump (water at 7 metres I think that's about 21ft ) to provide water for cattle. The water is brackish and has caused some corrosion on the casing that has resulted in the thread on the outlet of the casing leaking. My question, the outlet pipe is polytubing and the casing is cast iron is there a type of sealant I could use to stop the leak (teflon tape hasn't worked) I don't really want to pay $300 or so for a new casing and injector. any suggestions most welcome. I live in Australia.