Question about Culligan Under Sink Water Filter

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Inoperative Culligan RO water monitor (LEDs don't light up)

We bought a home with a Culligan RO system - maybe 16 years old. The water dispenser is equipped with a good water sentry monitor. There are two LEDs on the dispenser - green for good, red for bad, I guess. I changed the 9V battery, which was dead, but neither LED lights up when the water is running. The plastic box under the sink looks like it has two phone cord jacks plugged into it, along with a circuit board, a dip switch for setting PPM levels and the 9V battery. Any thoughts on what may be the problem? Thanks, Dave

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Dave,

If you have concern about the quality of water being produced by your RO system, I would recommend using a handheld or in-line TDS meter. Instead of a red or green LED, these meters will give you a reading of TDS (total dissolved solids) in parts per million (PPM). With either of these meters you are taking a reading from the feed water to the system as well as from the product water, you then can calculate the percentage of solids being rejected by the RO system (using the simple equation listed below). This way you will know exactly how well the RO system is working and when the membrane needs to be replaced. I have included links below to our selection of handheld and in-line TDS meters as well as an instructional video that explains how to use a handheld TDS meter.

Here is a helpful link that includes the formula for calculating percent rejection.
http://www.freshwatersystems.com/t-measuretds.aspx

Handheld - http://www.freshwatersystems.com/c-253-handheld-meters.aspx
In-line - http://www.freshwatersystems.com/c-255-in-line-monitors.aspx
Video - http://www.freshwatersystems.com/t-videos.aspx

Geoff D., CWS-I - WQA Certified Water Specialist
Fresh Water Systems, Inc - http://www.freshwatersystems.com 1.877.335.3339

Posted on Aug 01, 2009

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