most ponds should be turned over once every 3-4 hours, koi ponds its once every 2 hours
as you say your pond is 80 gallons you need a pond pump which can pump 20 GPH (also see note at bottom)
you may not find such a pump, (because they don't make them in to exact pond volumes) but if you find one that is say 25 GPH you can turn it down, but like wise if you find one that is 15 GPH you
can not turn it up
filter pumps have no inline "tap" because they are meant to pump solids, a tap will block soon. Sometimes filters will over flow, this is because the outlet is blocked or the filter needs cleaning, its not that the pump is too powerful, it can also be the filter is too small in the first pace.
some people return the water to the pond via just the pond outlet have a look at the bottom left picture
here
as you have fish you should have a filter, you can not have "a bit of a filter" since most box filters are based on the small water storage tanks. Some say you can "balance" the pond, but this rarely works 100% of the time, so filter it is then.
The most common type of filter is the box filter, (as mentioned) you can "camouflage" these or just hide them, there is also available a pressurized filter which you can bury most of in the ground.
most box filters can ony return the water by gravity, so that is why most people have a water fall, its not just for decoration, its to return the filtered water.
As pond filters must run 24/7 and you want a small fountain, i would suggest you have 2 pumps, one for the filter and one for the fountain.
you can get an "oversized" fountain pump that will quite happily do both, but the problem is you cant stop the fountain at night, since the pump is running the filter as well, but with 2 pumps you can.
as your pond is 6 x 4 x 2 it can hold up to 229 gallons, not just 80. (but the calculation does not consider and shelves) so i would suggest you look for a pump that can pump around 40-50 GPH
regarding your question:
Height Flow
Max Flow
2000lts/440Gals
what does all this mean.
all pumps have a flow graph (i bet you wish you had not have asked)
they can only pump to a specific height, as the height gets tall er the less water can flow to that height. I found a more detailed explanation
here
Max Flow is my next door neighbour, no only kidding, max flow is the maximum flow (amount of water) a pump can pump measured in gallons or litres
2000lts/440 gals
is 2,000 litres (metric) or 440 gallons (imperial)
it just makes it easier for old boys like me, in that i prefer gallons to litres.
(finished)
