"Andymcgoo" wrote in message
. ..
Please can you help, I have had a problem for about 6 weeks now. I have
got a small pond and I have had a lot of trouble with fish not surviving
in the water. I have had the water tested for the usual PH and nitrate
problems all coming back ok. I have emptied the pond scrubbed the liner
and refilled. This time I changed the water circulation so I have several
fine jets of water from my pump back into the pond to get more oxygen
into the water. This time I have not stocked the pond or put any plants
into it I plan to do this after a week or so. My problem is that after 2
days a layer of white film has formed over the bottom of the pond all
over the liner. I live in north Kent and we have very hard water. I do
not know what the film is or if it is safe for fish. We have not sprayed
or fed any plants I have talked to southern water who are not interested
because it is a pond and not domestic water supply. Have you got any
ideas?

Check the alkalinity and the general hardness of your water. It sounds
like you have a high mineral content in your water, and it is precipitating
out. You might also want to check the salinity just to be sure that the
water isn't too salty (assuming that you aren't using city water). As for
the fish dying, you need to tell us the volume of your pond, what kind of
filtration you have (if any), and provide us with the following parameters
(pH, GH, KH, ammonia, nitrites, nitrates, temperature). Since you appear
to have something precipitating out of your water, you should also do a
calcium test. Also, if you could describe the behavior of the dying fish,
and their general health (torn fins, sores, discoloration around gills,
mouth, etc.).