The best solution would be to get a reverse osmosis system to feed the ice maker and drinking water systems, and soften all other water. This way you will have the cleanest possible water for drinking, cooking and ice. While saving your expensive fixtures from the hard water. Under sink filters will remove sediments and some chemicals (depending on the filter). In the long run you will spend more money on those filters than you would with an R.O system, and not have as safe water. Your dish washer should only have a hot water feed and that should be soft.

A plumber is a plumber, he is not a water expert. Talk with one of you local conditioning companies.

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The best solution would be to get a reverse osmosis system to feed the ice maker and drinking water systems

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JMO

Dan O.
www.Appliance411.com
The Appliance Information Site

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It is also true that you can not use copper line to run the R/O water through. Thus plastic line is used. There is no problem using plastic line to hook into an icemaker feed. Every new fridge uses plastic line internally now.

It may not be a problem but can. These are quotes from the Amana web site, most of the other fridge manufacturers have similar recommendations:

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Can my reverse osmosis system be used with my icemaker?

We [Amana] do not recommend connecting the refrigerator water line to a reverse osmosis system. A reverse osmosis system may not provide the consistent water pressure required for the ice maker and/or dispenser to work properly. If the pressure is not high enough, it can cause the water valve to not close completely and allow water to randomly pass through it and overfill your ice maker.

What should the water pressure be in the water line for the icemaker?

There should be 20 to 120 pounds per square inch (PSI) of water pressure. If the refrigerator has a factory installed water filter, the water pressure should be 35 to 120 PSI.

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But most of the internal water lines are not subject to the heat in the area of the compressor and condenser which can cause a plastic water line to become brittle and fracture more easily. Most appliance service technicians recommend copper water line be installed whenever possible to help avoid the possibility of flooding should the water line break.

JFYI

Dan O.
www.Appliance411.com
The Appliance Information Site

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[This message has been edited by DanO (edited November 19, 2003).]