FWIW -- It is a TDS meter. Total Dissolved Solids.

Marc


TomW wrote:

The lights are less than 4 months old.

The TDM meter reads 4 on RODI water (170 on tap water).

Update: Protein Skimmer is producing a lovely brown liquid.

-TomW

How old are the lights?

Do you have a TDM meter? If so, whats the reading of your fresh RO/DI
water?




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