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Quick reference flow calculator in litres per hour for pond health

Step 1 - Establish your pond volume

 

  • Circular Ponds
    Diameter x Diameter X Depth (meters) X 785 = Volume in litres

  • Rectangular Ponds
          
    Length x Width x Depth (meters)  x 1000 = Volume in litres

  • Odd shaped (Such as Kidney or rounded corners)
           Average Length x Average Width x Average Depth (meters) x 800 = Volume in litres

  • Triangular
           Length x Width x Average Depth (meters) divide by 2 x 1000 = Volume in litres

Example A rectangular pond 4 meters average length x 3 meters average width x 70cm average depth

                      Pond Volume: 4.0 x 3.0 x .7 x 1000 = 8,400 litres

Important If the sides of the pond are not vertical but tapered, reduce the volume by 10%
 

Step 2 - Pick your correct flow


Please make a note of your pond volume now. Now apply the pond volume to the chart below, using the fish stocking and sun situation of your pond to determine the approximate water flow required to maintain a healthy environment for your pond and it's inhabitants.
 

Choose the fish stocking that best suits your future fish stocking (allow a little extra for growth)

No fish No fish = Natural garden ponds with plants but no fish.
Small fish = Light fish - Natural garden pond with plants and total fish length up to 400mm* per 1,000 litres
Small fish     Small fish = Medium fish stocking - Pond with plants and total fish length of up to 800mm* per 1,000 litres
or  Light Koi/Turtles with a total length of up to 400mm*  per 1,000 litres
Fish of 3 = Heavy fish stocking with a total length up to 1000m*  per 1,000 litres
 or  Medium Koi/Turtles with a total length of 500mm*  per 1,000 litres
 Small fish
Fish of 4
= Extra Heavy fish stocking with a total length over 1000mm*  per 1,000 litres
or  Heavy Koi/Turtles with a total length of 500mm*  per 1,000 litres


*Fish when measured end to end                   Special note - The more plants the better
 

Armed with the pond volume and fish stocking, add the other factors, sun shade etc

 

       Pond in shade

      IPond in partial shade 

Pond in full sun,
 

 

Pond in shade

Pond in partial shade  Pond in direct sun
  Or shade cloth Sun on the pond for a max of 50% Full sun in summer all day

Pond
volume
Litres

no
fish

Small fish

Small fish  Small fish

fish 3

 Small fishfish3 no
fish

Small fish

 Small fishSmall fish

fish 3

 Small fishfish 3 no
fish

Small fish

 
Small fishSmall fish

Fish of 3

 Small fishFish of 4
250 131 194 256 319 381 138 200 263 325 388 156 219 281 344 406
 350 184 271 359 446 534 193 280 368 455 543 219 306 394 481 569
400 210 310 410 510 610 220 320 420 520 620 250 350 450 550 650
600 315 465 615 765 915 330 480 630 780 930 375 525 675 825 975
750 394 581 769 956 1144 413 600 788 975 1163 469 656 844 1031 1219
1,000 525 775 1025 1275 1525 550 800 1050 1300 1550 625 875 1125 1375 1625
2,000 1050 1550 2050 2550 3050 1100 1600 2100 2600 3100 1250 1750 2250 2750 3250
3,000 1575 2325 3075 3825 4575 1650 2400 3150 3900 4650 1875 2625 3375 4125 4875
4,000 2100 3100 4100 5100 6100 2200 3200 4200 5200 6200 2500 3500 4500 5500 6500
5,000 2625 3875 5125 6375 7625 2750 4000 5250 6500 7750 3125 4375 5625 6875 8125
6,000 3150 4650 6150 7650 9150 3300 4800 6300 7800 9300 3750 5250 6750 8250 9750
7,000 3267 4822 6378 7933 9489 3422 4978 6533 8089 9644 3889 5444 7000 8556 10111
8,000 3360 4960 6560 8160 9760 3520 5120 6720 8320 9920 4000 5600 7200 8800 10400
9,000 3780 5580 7380 9180 10980 3960 5760 7560 9360 11160 4500 6300 8100 9900 11700
10,000 4200 6200 8200 10200 12200 4400 6400 8400 10400 12400 5000 7000 9000 11000 13000
11,000 4620 6820 9020 11220 13420 4840 7040 9240 11400 13640 5500 7700 9900 12100 14300
12,000 5040 7440 9840 12240 14640 5280 7680 10080 12480 14880 6000 8400 10800 13200 15600
15,000 5727 8455 11182 13909 16636 6000 8727 11455 14182 16909 6818 9545 12273 15000 17727
20,000 7636 11273 14909 18545 22182 8000 11636 15273 18909 22545 9091 12727 16364 20000 23636
25,000 8750 12917 17083 21250 25417 9167 13333 17500 21667 25833 10417 14583 18750 22917 27083
30,000 10500 15500 20500 25500 30500 11000 16000 21000 26000 31000 12500 17500 22500 27500 32500
35,000 12250 18083 23917 29750 35583 12833 18667 24500 30333 36167 14583 20417 26250 32083 37917
45,000 13500 19929 26357 32786 39214 14143 20571 27000 33429 39857 16071 22500 28929 35357 41786
55,000 16500 24357 32214 40071 47929 17286 25143 33000 40857 48714 19643 27500 35357 43214 51071
60,000 18000 26571 35143 43714 52286 18857 27429 36000 44571 53143 21429 30000 38571 47143 55714
65,000 17063 25188 33313 41438 49563 17875 26000 34125 42250 50375 20313 28438 36563 44688 52813
75,000 19688 29063 38438 47813 57188 20625 30000 39375 48750 58125 23438 32813 42188 51563 60938
85,000 22313 32938 43563 54188 64813 23375 34000 44625 55250 65875 26563 37188 47813 58438 69063
95,000 24938 36813 48688 60563 72438 26125 38000 49875 61750 73625 29688 41563 53438 65313 77188
100,000 26250 38750 51250 63750 76250 27500 40000 52500 65000 77500 31250 43750 56250 68750 81250

Also allow for pond depth, your location and hose


If the pond is

  • less that 300mm deep add 75% to the flow 

  • between 301 & 450mm deep add 50% to the flow

  • between 451 & 600mm deep add 25% to the flow

If you live in

  • Tropical (Qld, NT or northern WA) add 35% to the flow 

  • Sub tropical (Northern NSW) add 25% to the flow 

  • Temperate (NSW, SA, VIC, Southern WA) add 15% to the flow

Hose length and diameter

If your total hose length is over 4m, or your waterfall is over 500mm, or if you have an existing hose that may be too small and can't be replaced, it may now be the time to either:

  1. Fill in one of our e-mail help forms and let us do all the calculations for you

  2. Give us a call 1800 607 388 for expert advice

Step 3 - Choose your filter


You now have the ideal flow
through the filter in litres per hour for a healthy pond.

Now you need to decide what type of filter your require.

Always choose the filter first.
The horse must be ahead of the cart, so the filter must first be chosen. Then on each filter page there is a section named "suitable pumps"

(Remember your ideal flow through the filter will be needed)

How we established these figures


The above quick reference calculator represent the approximate circulation required for a pond in Australia using average calculations, for a more in depth explanation, see "How to choose a pond pump and filter"  for extremely accurate formulas

When making the above calculations we have taken into account average Australian climate, average pond plants, average pond depth (on the shallow side), flow loss through a filter etc.
 

Special note:

Please use this chart as close guide only, the only way to exactly choose a pump and filter is by using all your specific and exact factors, the above if used correctly should get you within 10 - 15% of a perfect outcome. In doubt either fill in one of our e-mail help forms or call 1800 607 388.