I filled a glass with water from my 5-stage osmosis filter and noticed
an odor. Not a familiar odor but certainly not something I care to
drink.

A little more info:

I purchased this home in May 2006. It has a water well, a deep well
system. The water quality test required by the mortgage company showed
no signs of bacteria. They only tested for bacteria.

The well water is clear and has no odor whatsoever. There is a slight
film of red sediment in the bottom of my water jug that I take to work
each day. The water tastes great. This water leaves no mineral deposits
on faucets or teapots, etc. The TDS is only 140 ppm. The soil in this
part of central Oklahoma is very sandy.

I have owned the 5-stage under-sink osmosis system for several years.
Until I bought this home in May it was used on a municipal treated
water system and worked great.

The pressure tank for the filter system was in storage during the
summer in a hot shed. I couldn't really fully drain or dry the inside
of the bladder tank so I was worried about what might be growing
inside. Before installing the system in my new house I sanitized the
bladder tank with a mild chlorine bleach solution.

I installed the system with new filter cartridges and it is working
great. The sediment filter turned red the very next day so I figure
I'll be changing the sediment cartridge more frequently.

It's been about two weeks and I just noticed the odor in the filtered
water. The unfiltered water from the well does not have any odor. I let
the filtered water run from the spigot for about 30 seconds and I could
no longer detect the odor. I ran most of the water from the storage
tank and let it refill. The next morning the odor was again present.
The TDS readings for the filtered water is still very low as would be
expected. The water is properly filtered it just stinks. This leads me
to believe that storage tank may be contaminated.

Most people use RO systems to remove odors. Mine is creating an odor
where there was none present! Your experiences or advice would be
appreciated.

John,
Bethel Acres, Oklahoma