Well, let's just look at the basics for a moment. The purpose of biofiltration is to insure that adequate surface area is available to support the nitrifying bacteria population level needed to oxidize the Ammonia (and subsequent Nitrite) produced by the fish and other processes in a pond.This pump capacity thing is where I see really conflicting advice. Most everything I've seen suggests half to 1 times the full volume of the pond per hour. But I see you constantly recommend twice. Can you explain? Is this a difference between a heavily loaded koi pond and a lightly to moderately loaded water garden?
Depending on manufacturer and pump model, you can get the same flow rate with two (2) smaller pumps as with one (1) larger pump for the same or less electrical consumption. There is the additional advantage of built-in redundancy. If a pump fails, the second pump is still functioning to at least provide some circulation to your filter and pond. On my pond, I had a flow target flow rate of 10,000 gph. I divided this between a 7500 gph and a 2900 gph pump. The 7500 supplied the twin biofall filters and the stream and the 2900 supplied the wetlands filter. Each was located in separate skimmers. These were both direct drive solids handling pumps. Not necessarily the most efficient. The electical costs for both pumps was less than $50.00/month. The cost for one 10,000 gph pump would have been around $75.00/month.The two pump idea is interesting to me as I plan on pump purchase soon for my approx. 3k gallon pond. Perhaps having a uv of the return line off one of the pumps would be valuable as well? So two smaller pumps would save on electricity as well?
Sissy uses this system to save on electricity and have backup.Depending on manufacturer and pump model, you can get the same flow rate with two (2) smaller pumps as with one (1) larger pump for the same or less electrical consumption. There is the additional advantage of built-in redundancy. If a pump fails, the second pump is still functioning to at least provide some circulation to your filter and pond.
Based on your location and zone, is there any reason you're not going down 3-1/2 to 4 feet? Are you incorporating a main drain? Highly suggest both of the above. I have a bio-filter and large Savio Skimmer with main drain. Can't stress enough the importance of a main drain and skimmer assuming this isn't a bog setup. If this is a dedicated koi pond?, and cost isn't a problem, these components are a must which keeps maintenance quite low. A UV in my opinion is also a must....
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