High Efficiency RO/DI Systems

[Myka]

Originally Posted by StirCrazy

Ok so stop doing this, you are adding zink and other stuff to your water by using the hot water tank which may or may not be removed. also your water from a hot water tank that has some age behind it will be higher tds than the cold water.

Steve

Yes thanks Steve, this I know. Zinc is only found in trace amounts in straight hot water even in old tanks. An RO unit will remove that trace amount. That trace amount is also diluted by only using a small amount of hot water with the cold water. The amount of wear on the membrane is much less significant compared to the amount of water saved by using slightly warmer water. I also start up the RO unit after having a shower, which will further dilute the amount of zinc in the water in the hot water tank.

I tested the tds of the hot water (before having a shower), and found it to actually be the same tds at the cold water.

You brought up a good point though, something that people should be aware of.