Choosing A Pond Pump
Pond pumps are the very heart of any fish pond. All water gardens
can be enhanced by the addition of water fountains, waterfalls, and
other moving-water features.
The pond pump is your best friend if you're planning to create water effects in your pond. Even if you are not planning
to have fountains, or waterfalls, pond pumps are essential for oxygenating
When choosing a pond pump, keep the following requirements in mind.
The first thing is to determine your required flow rate. Your minimum
flow rate should be at least half of your pond volume. So, if you have
a pond with 2,000 gallons of water then your pump needs to at least
circulate 1,000 gallons per hour (GPH). This is a minimum. You might
find that 1,000 GPH is not enough if you will be including, for example,
a waterfall that is more than 10 inches wide. Generally a waterfall
requires 100 - 150 gph per inch of width of the weir (the portion that
the water spills over). This can vary depending up on how smooth or
rough the weir is. You will also need to be sure that the pump moves
enough water to satisfy the requirements of your filter and ultraviolet
So, which type of pond pump is right for you? That depends upon your
pond's design and purpose. Submersible pumps are best suited to small
to medium sized ponds with roughly 200 - 800 gallons of water. These
types connect easily to most of the submersible filters built for small
to medium sized ponds. Flow rates usually range between 250 GPH and
4,100 GPH. for a larger waterfall pump.
Submersible pumps operate inside the pond. They are generally low cost
to buy. Many models of submersible pumps are available,
and they are a good choice for flow rates around 1,000 gph or less.
Submersible pumps are usually less expensive and easier to install than
an external pond pump. On the downside, they can cost more to operate
and usually don't last as long as external pumps (having shorter
manufacturer warranties.) The motors of most
submersible pumps are totally encased in a resin so that they are safe
to use underwater. Most submersible pumps cannot be repaired, for safety
reasons. So, once it wears out, it's time to get a new one!
Many variables are taken into account
when determining how long a good submersible
pump will last. Issues such as how dirty the water is, how often the
pump is cleaned, and if it is operated nonstop, all will influence the life span
of a pump.
Submersible pump power supplies come in 110 240 volts, 12 or
24 volts, or solar powered. Solar submersible pumps are becoming more
popular - but you need lots of sun for effectiveness and, of course,
they won't run at night when your water needs the most oxygenation.