| Hi Russ,
Yep i do test for ORP in fact i test for most things and my pond runs at around 300-330.
Do i do anything yes i keep and eye on how the pond is functioning and will tell me hoe polluted the water is with organic waste/material. The lower the reading the more organic waste is in the system which will normally increase the TDS levels. So if the level was to start dropping i would know that the filters would need cleaning.
i would also use this and think its a very important tool if you are to use PP in the system
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Regards
Gazza
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