"Richard Kerry" wrote
Thanks again....so, how do I configure a workable filters, UV & Grundfos
pumps combination?

Depends how you intend to site your filters, if they are set into the ground
with a pipe from about the middle depth of the pond you can let the water
simply flood across to the filter through the UV. Then the pump is placed
after the filter connected to a pipe from the bottom of the filter then back
into the pond through a venturi which will greatly increase the gas exchange
between air and water.


How do I know which pump would be suitable for a pond my size today and
tommorow? If I went down the Grundfos route how do I know if the pump is
suitable, what am I looking for when I speak with the plumbing chaps?

Gals or Litres per hour, and you can find out how many your filter needs
first and then get the correct pump. If it's a big plumbers merchants then
you won't have been the first pond keeper to ask about such things.


If I decided not to use the pressurised system, how would I configure a
filter (standard box type), UV & Grundfos pump setup? How many gph/lph for
the pump to process? What size UV, presumably installed in line??

As above, the volumn per hour depends on the size of filter and those
details should be available when you buy one. Simply get a UV for the same
volumn, the bulbs only last a season though so check they aren't too
expensive.


You also mention that the pump needs to be below water level? Does this
mean below the water line or below the bottom of the pond? Either way it
would seem that I would have to dig a (waterproofed) hole for
installation? And what about connectors? And checking the Grundfos web
site won't this pump be affected by

Below water level as they don't suck and need a constant feed of water, they
will push it up 40 or even 60 feet but they can't suck at all.
Yes they must be kept dry, but it's not as difficult as it might at first
seem. The Grundfos will need to be connected through a weatherproof outside
socket which can be wired to the dry hole you intend putting it in. A square
plastic bin, small water tank, with a tight fitting lid would do.
I have never had a problem with cold affecting the pump and I've used them
for over 20 years. They do throw out a bit of heat anyway so in a closed dry
sump they won't get cold. :-)
One advantage of the grundfos is that it has three speeds so you can turn it
up in summer and down in winter.

Apologies for so many questions, yet again! The more I learn the more I
realise the more I need to learn...........


Who said we ever stop learning?

--
Regards
Bob
In Runnymede, 17 miles West of London