If the water cycle shuts down to such a degree that the desalinated water is not making it back into the oceans, we have planetary-scale problems far more worrisome than a slightly elevated ocean salinity.
If you had an absolutely huge number of these in a small area, I'm sure you could probably create a localized disturbance in the salinity. But 13k gallons is a pretty trivial amount. That's a 50 meter cube of water per day... in the ocean.