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Re: Good, better, best

Posted by JR on 11/4/2009, 2:04 pm, in reply to "Re: Good, better, best"
162.111.195.14

Morning Mike, get spending some time with you this past weekend! I'd like to review the facts a bit. All closed end koi ponds produce ammonia- that is the easy one to get rid of. Yet this INorganic material rules the minds of all ponders in the first year of setup. When the new koi keeper turns to organics it is usually to make the water clearer and not much more than that. So mechanical efforts are first employed to trap and strain organics. And at this point in the hobby experience feces are pretty much all beginners identify as organic waste. yet these delicate decaying organics , when strained' quickly become smaller subdivisions of the the macro material. To understand an outdoor koi closed system we need to accept that it is IMPOSSIBLE to remove all organics and all bacteria associated with mineralization. On the other hand, as important as ammonia removal is, we also need to take organic removal just as seriously. On another level, every koi keeper must realize that ammonia comes from the fish themselves and from decay. And decay also delivers other pollutants to the water in the form of fines, foreign particulate matter ( pollen and other organics from outside the pond), fish slime ( a HUGE organic pollutant not unlike having a dead fish in the system when it is all added up) and the infamous DOC ( the key operative word here is DISSOLVED). Now no amount of trapping and straining will remove that. Of even greater importance in a closed system is the concept of a 'leaky system'. We WANT gases that are produced from both nitrification and mineralization ( and Heaven forbid, denitrification) to be vented out into the atmosphere and not trapped in the filter or water column. So to answer your question directly; Jmat is subject to biofouling. This is why it should NEVER be used as a strainer or vertical wall in which water passes thru. It should be an open well vented surface. Key here is the ability of that mixed biofilm to vent it's gaseous byproducts. I'm sure you have seen Jmat in that application that remains remarkably clean ( with mats cleaned maybe seasonally if at all). And in high season, the chamber should be dumped weekly and the sumps daily. This design, along with this maintenance schedule will find that happy medium between heterotrophic and autotrophc species. JR

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