The only fittings I've used in service like that that WERE reliable were Jaco Kynar fittings. They are quite expensive, but I used them when I set up chlorine feed systems for large (>100,000 gallon). I bought them direct -- but I bought a LOT.
US Plastics sells them: http://goo.gl/Z1fkD
These are a permanent fix, in my experience, and will outlast the tubing AND the chlorinator.
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