Dae wrote:
The over flow is directed into the shower, but it is a constant flow.

Even though the flow is constant does not mean that it is not
restricted. Think about it. That flush is saturated with salts and
minerals which are the waste of the system. It has probably built up
inside the tubing and is restricting the flow.

Remove that tubing so that you can get a closer look at it. If you are
not able to determine if it is clogged, then replace them. Vinyl
tubing is cheap enough.

Lawrence