How To Choose The Correct Pond Pump
Choosing a pump for your pond or fountain is a crucial step to ensure you maintain proper water movement. Failure to keep the water adequately circulated can result in stagnation, algae buildup, and mosquitoes. In addition, if you have fish, plants, or other aquatic life in your pond, you must keep the water healthy by evenly distributing the oxygen levels and other nutrients.
Types of Pond Water Pumps
There are two main types of pond water pumps: submersible and external (out-of-pond), also known as centrifugal pumps. Depending on the application, each pump offers specific advantages.
Submersible Pond Pumps
Submersible pumps are designed to be fully submerged underwater at the deepest part of the pond. They are placed directly into your pond or in a skimmer box or pond vault. Submersible pumps range in size from 50 to 5,000 gallons per hour. They are easy to install and are sometimes a more economical solution for smaller ponds (up to 1000 gallons of water). They are also quiet and can also be used to drain your pond. If you have fish or other aquatic life in your pond, you may want to consider a model that does not use oil because there is a danger of the pump seal breaking and oil coolant leaking into the water.
Centrifugal Pond Pumps
External or centrifugal pond pumps are a reliable, energy-efficient option. They are installed in a dry location near your pond. External pond water pumps are suitable for larger ponds (over 1000 gallons). Compared to a submersible pump, they are typically louder and more complicated to install; however, they are easier to maintain.
When selecting a pond pump, it’s essential to keep in mind that pumps have different cord lengths. Ensure the cord is long enough to go through the pond and plugin far away from the water. Some electrical codes specify that the outlet for water features must be at least 6 feet away from the water. Therefore, it is recommended that you avoid using an extension cord. However, if you must use one, make sure it’s suitable for outdoor use and plugged into a ground fault circuit interrupter (GFCI) so that it will immediately shut off if there is an overload.
How to Size a Fountain or Pond Pump
Pond pumps are sized by gallons per hour (GPH) at one foot of lift or height. Larger capacity pumps are rated by horsepower (HP). To determine the size pond pump, first, you need to calculate the volume of water in the pond. To calculate the volume of water in gallons, multiply the length x width x average depth x 7.5.
Water Circulation Factors
It is recommended that pond water is circulated at least once per hour. For example, if you have a 500-gallon pond, you need a pump that runs 500 gallons per hour at the discharge height. If your pond has a pressurized filter, you ideally want to turn the water approximately once every two hours. For example, if you have a 1000 gallon pond, you need a pond pump rated at a minimum of 500 GPH. If your pond has a skimmer or waterfall, the water should be turned approximately once every hour. Therefore, if you have an 1800 gallon pond, you will need an 1800 GPH rated pump.
Calculating Head and Lift Height
Two of the most critical measurements in sizing a pond or fountain pump are the maximum head height rating and maximum lift. Head height means the vertical height the pump raises water above the surface of the pond. The pond fountain pump’s top height can lift the water to is called “Maximum Head” or “Max Head.” The “Head” is measured straight up from the water level of the pond. Its length then measures any horizontal/diagonal flow, and 1’ of “Head” added per 10’ of horizontal/diagonal distance. To calculate the lift, you need to measure how far the water in your fountain has to travel from the pump’s location in your rush to the top of the fountain where the water comes out. Then you need to select a pump that lifts higher than that measurement. For example, if that distance is 24”, than you will need a fountain pump that lifts at least 36” tall. The “maximum lift” is the maximum height that the pump will raise the water.
Selecting the Proper Pond Water Pump Tubing
It is also essential to use the correct tubing size because it directly affects the pond pump’s maximum lift capability. If you use smaller tubing than specified, you will limit the pump’s maximum lift and the amount of water circulated.
Choosing the right pond water pump for your pond or fountain requires careful consideration and a little upfront research. However, doing so will go a long way toward keeping your water clean and healthy and your pump operating efficiently.
Planning: Pond Calculations
Here’s the rule of thumb for measurement of your pond.
SQUARE FEET on the surface area.
- Rectangle
length x width = Square feet of pond
- Circular
3.14 (1/2 diameter x 1/2 diameter) = square feet of surface
NUMBER OF CUBIC FEET
- Rectangle
average length x average width x average depth = volume in cubic feet
- Circular
3.14 (1/2 diameter x 1/2 diameter x depth = volume in cubic feet
To calculate GALLONS in your pond
cubic feet x 7.48 = capacity in gallons
FORMULAS TO DETERMINE APPROXIMATE AMOUNT OF ROCK NEEDED:
- Quantity of BOULDERS in a pond (tons) = length (ft) x width (ft) divided by 65
- Quantity of BOULDERS using 1.2.1 ratio. Length x Width divided by 40
- Quantity of 1/4 inch to 3 inch GRAVEL (tons) = tons of boulders x .45
- Quantity of BOULDERS in a STREAM = 3/4 TON PER 10 FEET OF STREAM LENGTH
Around the FACE of A SIGNATURE 6000 BIOFALLS you will need approximate 3/4 TO 1 1/4 tons of boulders.
Note: If you are building a large water feature you will need to increase the tonage of rock as the stone you will use will be larger and carry more weight.
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Dividing Plants at Spring Clean Out
Your plants can be divided in the spring and, if in pots that you can lift out of the pond, you could wait till late spring if you so desire as any plant can be divided up to early August. All perennial plants such as all Pickerel, Arrow plants, Iris and any other perennial plant in your pond should be divided approximately every three years depending on how large they have become or how crowded the pot has become.
Marginal plants can be divided two ways; either you can gently pull apart the plants which will leave you with several new plants. Or you will need a knife to cut through the plant. Plants like Pickerel, arrow plants grow in a bulb type and can be easily divided. Gently tease the growing points of the plant apart and/or dividing the plants at a natural breaking point. Iris grow in a rhizone which also can be divided by pulling apart, just be careful that you get some root with each plant. Always throw away mushy or diseased sections. Trim back any old or dying leaves, old rootstock or spent flowers.
If using a knife, clean with a bleach solution before cutting other plants. Some of the bulb plants such as the Arrow plant are late to produce any growth. You will just see the bulb and if it is in a pot, just thin out. If planted in the pond, you may have to look hard for these bulbs or divide later. Iris rhizone can be divided and replanted in the pond. Iris do not need to be planted very deep and only like their rhizone wet. Most of the pickerel, rushes, iris, and arrow plant need to be on the first shelf as they are marginal plants. The second shelf is usually held for the Lilies.
Floating plants (such as parrot’s feather) and oxygenators (anacharis, hornwort) need to be trimmed also. Trim off 6 to 10 inches of the fresh growth at the top of the existing strands. Cut out the middle section of straggly growth. These cuttings will root on their own accord. Parrot’s feather can be tucked into the rock substrate to hold it in place or placed in a pot.
Lilies have two forms:
Clump-Forming Lilies and Tuber-Type Lilies.
Clump Form Lilies
The clump form will produce new baby plants at the base of the mother plant. Wash the soil off the roots and look for these delicate little plantlets at the crown of the larger plant. Gently work them a part. Mix a granular, slow release fertilizer into the soil at the bottom of the plant pocket or pot and replant the largest clump with the crown at or just above the soil surface. Soil just needs to be good clay dirt not potting soil or use aquatic soil (available at any Home Depot). Remove any ragged leaves and flower buds to save energy for root growth. Always use pebbles on top of the soil to prevent fish from disturbing the soil and fouling up the water in your pond. Believe me this can make quite a mess in your pond by turning your water brown if you do not use gravel particularly if you have large fish.!
Tuber-type Lilies
The tuber form of the water lily produces new plants off the rhizome or tuber. Find a firm piece of tuber with plenty of growth points and use a clean, sharp knife to cut off a section that is at least two inches long (three or four inches is best). It might be tempting to just snap off a chuck, but a clean cut will heal faster.
Mix granular fertilizer into fresh soil at the bottom of the plant pocket or pot and plant the tuber with the cut end against the side of the pot/pocket. Make sure growth points are at or above the soil surface, but the cut end can be below the soil. Layer pea gravel or a couple of well-placed rocks that help keep the plant in place until its new roots anchor it. Also, remove the ragged
leaves and flower buds to save the plant’s energy for root growth.
Tropical Lilies are Different
Starting out as a small, moldy looking bump at the leaf’s sinus (the point where the two lobes of the leaf meet), a tiny plant clone forms. Cut the stem of the parent leaf, turn it upside down on the water surface and a plantlet will grown from the leaf sinus. When roots form, the plantlet can be removed from the parent leaf, planted in a small, soil-filled pot and placed in shallow water.
As with most lilies, when young plants have four or five good-sized leaves, it can be placed in a full size pot or plant pocket and placed in deeper water.
Fertilize again with tablets as the season proceeds. Push tablets down the sides of the pot away from the plant. Continue to feed your lilies about once a month until fall.
So don’t be shy….divide and share with your friends. They are hardy plants and as long as you keep them well hydrated, it is hard to make a mistake besides you will get more bloom from a plant that has more room to grow.
Happy Dividing,
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