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We do not currently have the replacement DO membranes however do expect to receive the membranes as an option in the very near future, They membranes may currently be available from Neptune Systems directly. Feel free to let us know if you have any further questions!
Sensor Membrane within the probe should be replaced every 3 months
Dissolved oxygen can easily be manipulated with either air pumps and air stones, aiming return nozzles at the surface of the water, or a water pump that vertically pushes the water to the surface to allow for gas exchange. In a typical reef tank most O2 is lost and transferred with CO2 at the surface of the water. Another large sink for dissolved oxygen to be consumed is settled detritus, food, and other dissolved organic compounds. As the process breaks down organic compounds dissolved oxygen will be consumed. For over stocked tanks that can cause a huge issue as your animals will consume the oxygen as well as their waste which could lead to dangerously low levels of dissolved oxygen.
Dissolved Oxygen Saturation Table
As an example a tank with a salinity of 35ppt and a temperature of 78.8 degrees Fahrenheit can have a maximum dissolved oxygen amount of 6.64ppm. A freshwater tank with a salinity of 5ppt at 75.2 degrees can dissolve 8.16ppm of oxygen at 100% saturation. On average dissolved oxygen (DO) rates will be around 70%. We suggest maintaining a DO level between 4.5-7ppm, as stress signs can be seen anywhere below 4ppm and fatalities can start to happen below 3ppm.
Not bad By David on 4/9/2016David would recommend this product to a friendIf you have the cash this is a pretty nifty probe to run with the apex (definitely if you are looking for all the bells and whistles). For the most part my O2sat is 90+% so this dose not seem to be necessary but it is sensitive and when my Alk went up, this was the first sing was the drop in my o2 sat.