A koi pond is a purpose built habitat "Living
Jewels" and as such, differs from any other garden water feature. Instead
of doing what so many do, that is dig a hole, throw in a liner, add water and a
few fish, and calls it a koi pond. You can't put more than about 20 full sizes
Koi in a 2,000 gallon pond, and to do that requires a lot of filtration and
aeration.
Koi pond’s requirements
Means you can't stand up in it without taking out a lot of the water, but it
will make it a little more difficult to clean out your pond. Locate the pond
out of direct sunlight all day long. If you have the money a gas pond heater
for cold climates is recommended. Very few ponds have a protein skimmer, but
they are very useful to reduce the organics causing the foam under your
waterfall, etc. Proper filtration system
is must for survival of koi. The returns through the sides of the pond from the
filtration system will produce a bit of a current and keep particulate
suspended and headed for the bottom drains or skimmer.
Koi pond with a liner

It is easy to manage but liner must be eco-friendly, because
koi are extra sensitive. The only difference between a liner pond and any other
is what's used to contain the water. All other technical aspects are the same.
Maintenance of koi ponds
with their types
It is very important to save you pond from leaking. Large
leaks in ponds are very easy to identify but most pond leaks are small and can
be quite deceiving at first. A small leak in a pond can be a very hard and
expensive problem to solve if you do not know how best to tackle it.
Different types of
pond
1) Concrete or
rendered brick
these types of pond are usually sealed with some kind of resin or pond
paint. You first need to check for cracks as this is the most likely reason
your pond has leaked. To fix this you will need to cement the crack and re-seal
or use a product called pond liner repair just fix it. If it seems to peel away
or is non-existent you will need to re paint it as it has become porous or
patchy.
2) Fiberglass /GRP
A pre-formed GRP pond is the toughest of all the pond linings but can still
suffer from water loss. Before you do this you may want to try covering the
area with just fix it
Pond liner repair kits or use a liner repair patch, they
are not full proof but I have had some good results employing these methods.
3) Molded plastic
Molded plastic ponds can be fixed with pond liner repair
patches. They suffer with the same problems a GRP ponds does but are far less
common.
These are the most common types of lining. Pond liner repair is useful for all
type of pond with surety of koi survival.