That's odd, in 21 years I've never seen or heard of this cracking but.. are the fittings being overtightened? Compression fittings are not to be tightened until they can't turn, that causes air leaks.
That and stress on the brine line would/could cause this problem. And any crack in the tubing would cause air to be sucked instead of heavy brine so it would not suck water and that means it can not regenerate the resin and the water will come up too high in the brine tank and you get hard water.
Then you need to regenerate it with the max salt dose lbs for the volume and type of resin in the tank. That's 15lbs/cuft of regular mesh resin. And then repeat that with as little water use between the two manual regenerations if any.
Residue... you mean as if you couldn't rinse soap off your hands? If so that means the water was soft; 0 gpg soft water. In 18 years as a local dealer, I rarely provided salt when installing a softener.... only for a rare customer that couldn't go buy their own and dump it in the tank. Then they would find someone else to do it for them.
Yes a local dealer can't afford to run around for free, it costs too much but he should find the cause and make it right regardless of what it costs him. So it is best for most people to become self sufficient, or independent and DIY.





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