Andymcgoo wrote:
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.

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.

Our water is also very hard and a white film forms on anythibg that
contacts it. However that doesn't seem to effect the health of the fish
at all. You don't mention if the water is treated or not, chlorine is
of course not good for fish. Is there any treatment for the hardness?
Before installing a water softener system, and taking the advice of
people in this group, I made sure there was a bypass valve so the
garden and fish pond could get untreated water.

Dave

http://members.tripod.com/~VideoDave/pool/pool.html