~ jan JJsPond.us wrote in message ws.com...
And, is the old filter still running? Pressure filters eat up buffer,
perhaps your buffering (KH) is down causing a pH crash and this would cause
ammonia not to be process by the bacteria in your old filter. ~ jan
Old filter is still running, the new sand filter has been added
between exit from old filter and return to pond.


The sand filter should not have any effect on the ammonia when new, and as
it grunges up, should help to lower ammonia and nitrites. Did you have a
spawn or a significant power outage that caused the high ammonia?
No spawning or power outages.

(Do you know where your water quality is?)

Tests showed zero ammonia, nitrite and nitrate a PH of 7.5 before
fitting sand filter. Three days after fitting sand filter ammonia
almost off the scale, minimal nitrite, zero nitrate and a PH of 7.5
have not checked KH.

Carl