https://www.bulkreefsupply.com/video/view/brstv-investigates-what-do-filter-socks-do-for-you/
If I recall correctly from the above video, by changing filter socks twice a week, BRS "proved" by swapping out said filter socks at this rate to be an acceptable method to help reduce phosphates. By changing out once a week or less it wasn't really worth it, if you are looking to reduce phosphates by this method anyway.
If I recall correctly from the above video, by changing filter socks twice a week, BRS "proved" by swapping out said filter socks at this rate to be an acceptable method to help reduce phosphates. By changing out once a week or less it wasn't really worth it, if you are looking to reduce phosphates by this method anyway.