They work great, and they do not strip out too much nutrients. They are like a filter sock. The only difference is when the filter gets dirty you do not have to change, it changes itself. For a filter sock to be effective you should change out about every three days. These basically advance once the water rises in the filter sock chamber, allowing nutrients to go back into the system like filter socks do. I have two of these units running on my system and love them.
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I wouldn’t recommend filter socks to anyone either, unless you’re doing some cleaning, and then they should be removed the next morning.
As long as your tank has good flow, the detritus won’t collect so much on the bottom of the tank. Organic phosphates are no threat except to provide a little extra food for your coral and filter feeders, and those are specifically what filter socks filter out. Inorganic phosphates, which is where the real battle is fought, and what your test kits measure, is not effected by filter socks, with the exception of how much they could potentially prevent by removing them before detritus is dissolved.
By focusing on proper inorganic phosphate management, you’ll have more success in the long run, plus you’ll allow more food for your corals to munch on.
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