I once ruined a set of membranes by putting chlorinated dock water in the boat and then back flushing. Since then any shore water that goes into the boat first goes through a “whole house” filter that removes chlorine. To check this, I have test stripes that measure the amount of chlorine in water. The test kit is sold in tropical fish stores. My filters are over 10 years old. I have been told that the more the filters are used, the longer they will last. When I don’t use the water maker much, the TDS goes up toward 300. When I use the water maker for my total supply off-shore or in a very clean harbor, the TDS goes back down toward 200.
I agree with the comments. I also run the water without pressure for several minutes when I turn it on to get all the fresh water from the back flushing out. I agree with Alan that the pressure with fresh water could be damaging.
Miles s/y Ladybug, sm216, locked down in Le Marin, Martinique