[dtbh]

Quote: Originally Posted by hwong Doc, SInce it works without your existing systems, it is a good thing as you now have more space to extend your pond!

Yeah, I have built many castles in the air but each one has been demolished by the home minister!

You are right. If space is a constrain BS/BH I believe is the way to go. However I would advise with some modification to what has been recommended. I have done a mental calculation as to the cost. If I factor in the land cost my 150% filter cost as much as the BS/BH (at 10kg BH/ton).