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It depends on the size of your o-rings and how much your applying each use, but for most folks in the hobby its a lifetime supply :-)
These lubricants are designed for use in drinking water systems are certainly can work in the tank without issue. Feel free to let us know if you have any further questions!
Dow 111 O-ring lubricant is used to prevent the O-rings in RO canisters from binding up when tightened and provides a tight seal.
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A must have for all orings By Ryan on 8/26/2016Ryan would recommend this product to a friendI put some of this on my Vertex Zeovit reactor o-ring on the rod that you hand pump everyday - made it 10 TIMES easier. Also plan to use it on any and all oring seals that need frequent removal - skimmer, filter canisters, etc. Good stuff!
Makes all the difference in orings By Al on 4/9/2016Al would recommend this product to a friendI used to have to reseat the protein skimmer orings as much as 5 times prior to using this -
I can't believe the stores that sold me products with orings did not tell me about this
Works Great By Dedeo on 7/6/2013Dedeo would recommend this product to a friendMy Marineland c360 canister filter was leaking and sending out millions of tiny air bubbles the 4th time is cleaned it. spent hours trying to figure it out. I emailed Marineland and they said I needed to lubricate the big Oring around the lid of canister. I said ''yeah right''. This stuff worked great. No leaking and no bubbles. The only reason I gave it a 4 star rating was because there were no instructions. This product works Great!!!!!!
Feel silly for not ordering before By Travis on 5/7/2012Travis would recommend this product to a friendSo I feel a little silly now for all the times I struggled and cursed at struggling to be able to open my RO canisters to change the filters! I should have know better but now that I do hopefully they won't be such a pain to open next time and if they're not I might have to invest in the larger size.