<a href=showthread.php?s=&postid=15607931#post15607931 target=_blank>Originally posted</a> by WaterKeeper
Hi Neil
<img src="/images/welcome.gif" width="500" height="62"><br><b><i><big><big>To Reef Central</b></i></big></big>
Germany was the hotbed of reefing in the past. We owe much to the to German technology in both FW and SW equipment and husbandry. The Berlin Aquarium Society developed the "Berlin Method" which is the basis by which are current systems of reef filtration started.
The far east also contributed greatly to the Natural Methods and the work of Lee Chen Eng introduced living stone and sand to much of the world. No matter where you travel, there are pioneers in marine aquaria that helped our hobby develop.
Creation,
When I speak of refractory compounds I am referring to those that are so biodegraded they are no longer broken down by bacteria. They are essentially inert and stay in place, much like plastic bottles in a landfill. This does happen with a DSB, products eventually form that collect in the sand. Matter just doesn't disappear and unless it forms a gas or finds another source of export, it stays put in our tanks.
This doesn't offset the value of a DSB it just means that after many years it needs to be removed or the bed loses its ability to reduce nitrates. Even Paul take apart his RUGF every so often.