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Nick - can't tell where your have the TDS meter probes. Are they on your 1) RO water and 2) DI water? There's no way your water would have been at 0 TDS BEFORE the membrane. Something's not right.... Russ

Iron and manganese are tough on RO systems. If you can soften the water before it gets to your RO system, that would be a good start. Russ

A good rule of thumb is to replace your sediment filter and carbon block after six months. A more precise way to maximize the useable life of these two filters is to use a pressure gauge to identify when pressure reaching the membrane starts to decline. This is your indication one or both of the...

Some people like the inline meters, like the DM1 or the DM2 The best feature of the inline meters is convenience. If precision is what you are looking for, or the ability to read TDS in more than two locations (feedwater, RO water, DI water), then you might want to go for a handheld like the...

A good rule of thumb is to replace your sediment filter and carbon block after six months. A more precise way to maximize the useable life of these two filters is to use a pressure gauge to identify when pressure reaching the membrane starts to decline. This is your indication one or both of the...

You want a waste to purified water ratio of about 4:1. The "waste water" really isn't waste - it is serving the purpose of flushing the membrane. This time of year however as the tap water temperature drops from the factory spec 77 degrees, you'll often see that the waste to permeate ration...

If you check the tds from your storage barrel immediately after you fill it, I'll bet you a dollar it is not still at 0 tds. Almost any contamination whatsoever in the container will move you away from 0 tds. But for practical purposes, maybe that's not really the issue - if the price you have...

Cool beans. Even at 5 ppm it looks like its time for a resin change... Russ

You're right of course, I wasn't very precise in my wording. What I intended to say was when systems are configured in series, and what was originally two concentrate flows become combined into one (by way of the concentrate from the first flowing to the feedwater port on the second), you have...

Sounds like you've got a good grasp on the situation. :) The issue comes into play when either a vendor, or an end user adds a second (for example) 75 gpd membrane in series, joins the waste lines, and uses a single restrictor designed for a 75 gpd membrane. This configuration yields the...

RE the difference between the DM1 and DM2 - the biggest advantage of the DM2 is that the probes can be individually calibrated. Russ @ BFS

For those with the auction site systems, take a look at it to see if they came with the horizontal DI stage. That is a fundamental configuration flaw common on retrofitted drinking water systems. At a minimum, remove that stage from its clips and orient the DI stage vertically with bottom-up...

In regard to running membranes in series (waste from first feeding the second membrane) - there is a misconception in the hobby that this is a easy way to reduce the amount of waste water. In some situations this is true, but not in most. Remember that membranes plumbed in series perform like a...

A few things you'll want in a system for use with "typical" feedwater without heavy sediment loads and without chloramines for this hobby: Aluminum bracket high rejection, brand name membrane 1 micron poly sediment filter 1 micron or smaller, high chlorine capacity carbon block No GAC stage...