There are two choices when it comes to the basic building of your koi pond filtration system. You can use either a pump-fed or gravity-fed system. There are advantages and disadvantages to both so you need to determined reconsider the alternatives.
In the pump-fed koi pond, dirty water from the pond is pumped from the koi pond to an external filter and clean water is return to the pond by gravity. A pump-fed pond requires two organize Components. There has to be a pump in the pond and the water has to be pumped to a higher level than the pond to allow for a gravity return. There are two main disadvantages with this type of design. The pump is in the pond pumping dirty water production it more susceptible to frequent clogging requiring maintenance. It also has to be fine adequate to lift the water to the filter system. This external filter theory sitting higher than the koi pond can make hiding it with landscaping more difficult. However, an advantage of this arrangement is that a water highlight such as a waterfall can be constructed to act as a water return.
These systems are the easiest to install and are relatively inexpensive. Since you will never be able to pump all the waste from the lowest of the pond, you will need to vacuum the pond to do this effectively. Ease of building and premise is a exact trade-off with cost of maintenance of the system.
In a gravity-fed theory the water in the koi pond and the filter theory are at the same level. A pump is placed in the last room of the filter theory to pump clean water back into the pond. A drain in the floor of the pond is used to drain dirty water into the filter theory by gravity. Unlike the pump-fed theory the pump in the gravity-fed theory is pumping clean water and less likely to get clogged. Maintenance costs will be less with this type of filter system. Because the filter is at the same level as the pond it can be more no ifs ands or buts accessed for maintenance and dismissal and can be no ifs ands or buts incommunicable by wooden deck work and landscaping.
All in all the gravity-fed theory is a better long term selection than the pump-fed theory even if it is a dinky more high-priced to initially install.
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