Oxyguard Dissolved Oxygen Probe

Oxidation Reduction Potential (ORP) is the measurement of water cleanliness. ORP level indirectly indicates the ability of beneficial bacteria in the aquarium to reduce contaminants like nitrates, ammonia ECT. Ultimately it is in part a measure of the electrical charge available to break down these contaminants.

Sudden changes in ORP are often reflective of organically bad things happening the aquarium. If a fish passes or too much food is available, the change in ORP can prove to be a much needed signal to investigate or take action.

While the cost of the Dissolved Oxygen Module PM3 is very reasonable, the down side is that the DO probe itself is relatively expensive.

The DO Probe certified and sold by Neptune Systems is a lab grade device and costs about 5x the cost of the PM3 module itself. 

That’s the bad news. The good news is that the probe has replaceable membranes so you don’t have to throw it away when it wears out like other probes. Instead, every three months you simply put a new membrane in the probe.