Re: Seachem--Matrix Thanks for the post. Matrix is an all natural porous media that never has to be replaced. However, from time to time, it may need rinsing, as it will accumulate a sludge on the outside. Simply take it out and gently rinse it under tap water removing any residual sludge that may exist. The great thing about Matrix is that it has the internal surface area that will retain bacteria even when rinsed. It is not necessary or recommended to rinse the media in bleach, as this will kill any bacteria that may have colonized the Matrix. Water will do the job just fine. If you do decide to use bleach, which again, we do not recommend, please soak the media in a dechlorinator, such as Prime, for several hours before use. We hope this helps and please let us know if you need any further assistance. Have a great day! |