Rust colored pre filter-- Anyone else?--

[belzebuth]

It is probably Ferrous iron.

According to information found:

"Concentrations of iron as low as 0.3 mg/l will leave reddish brown stains on fixtures, tableware and laundry that are very hard to remove. When these deposits break loose from water piping, rusty water will flow through the faucet.

Ferrous iron can be removed by an ion exchange process rather than filtration. Reverse osmosis with 5 micron filter CAN remove iron but is not recommended as the life of the membranes will shorten and cost would be prohibitive."

I think this is the case here and plugging up our RO/DI units.

Does anyone know where I can get Iron test strips ? I am currious to know the concentration in my tap water.