Feb 2, 2001, 5:08 PM
How to build a bio-filter?
Welcome into the koi hobby. Many of us are new in this hobby just like you. Lets learn together.
I am not sure of the model you mentioned. A general rule of thumb which I adopt is "Ensure that the water parameters are within the acceptable level." Irregardless of what filter media you use (be it volcano rock or otherwise) all the tell-tale signs are found in the water parameters. You already have that in the Ehiem (wet filter). The question is whether this filter is sufficient to maintain the pond. Also if the water fall is high enough coupled with the fall(flow) running thro' some man-made stones before reaching the pond, then you also have the trickle system.
Having said so much and if the water parameters are alright, then there is no need to build another filter.
Last of all, please have these test kits - pH, ammonia, nitrites. Nitrates test kit and baking soda are also good to have them around. For further info please read here.
(This post was edited by Mark Richman on Feb 2, 2001, 9:00 AM)