Phosban Reactor Help

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I have a phosban reactor on my 55 gallon reefready tankl that has been up and running sice the begining of Jan. My question is how often do I need to change the media in it? Any help would be great.

 

[wax32]

When you start seeing phosphates in your water tests.

 

[reefnut]

That is a tricky question to answer IMO... phosphates being the elusive element that it is, can read 0 on a standard test kit but still could be causing problems. Also the life span of the media is directly determined by the amount of phosphates in the tank.
I have always changed my media about once a month but that can also get expensive.

 

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ok thanks for the help, it has greatly reduced my hair algae in the last month.