Originally Posted by Cola ny
Hello everyone my freshwater tank is located underneath my bed...
I had one like this, the problem was literally 1" from the tank itself.
At the factory, the poly tank installed with a molded exit fitting, essentially a 1" diameter stub of thin-walled tubing coming from the bottom corner. PVC tubing was slipped over the stub, secured by a worm-drive furnace clamp.
Over the years, two things happened: the clamp loosened due to vibration; and, the stub collapsed under pressure.
As a result, water began dripping from the fitting. It was slow at first, then became more noticeable.
If you look closely, there is almost certainly some manner of access adjacent such a fitting. It will be easy to see if that is your source. And, the repair might be as simple as slipping an internal shim, like a PVC coupler, into the fitting before tightening. If that is indeed the problem, I like the plumbers grease at the home improvement stores that is essentially the silicone version of Vaseline: it both assists with installing shims and seals once things are in place.
For safety, part of my 6-month checklist is to trace every fitting from curbside to faucet, including the Manabloc, accumulator, pump, lines, each and every connector. Every time, there is something that has begun to loosen and maybe even drip under pressure. There is no pleasure akin to discovering a tiny puddle beneath a sink that would destroy all in its vicinity and induce mold, had it not been found early.