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Boden wrote:

wrote:

My contractor is installing a Whirlpool 40g water softener and the
main valve is leaking.
I noticed the in and out on the bypass valve is reversed (city water
is going in the Out of the valve, and the house is going to the In).
He said that should not matter as the pressure should still be going
to the home.
The manual also noted this is something that needs to be done
correctly.

Any advice?

Thanks.

Tell the installer to get out and do it right. IN and OUT are not
interchangeable. By reversing the connections he may have damaged the
softener by washing some of the ion exchange resin out...depends on the
specific design.

The OP said "the bypass valve is reversed". He didn't say
whether the softener was reversed. If it is just the bypass valve,
I don't see any problem, although it is a bit shoddy.
If the softener is reversed, that is not going to work.

OP: which is it?