You could also try some of your plants in a separate tub/pond with some
plant fertilizer and a better ph. See if they pick up. The fish should be
producing lots of fertilizer for you! Does algae thrive in your system?

Phyllis

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"lee" wrote in message
...
Plants in the vegie filter and pond are not growing strongly. Water cress
leaves are very small despite a good root system and plants in the pond
show
little growth. pH is 8.4. GH 60 mg/L KH 120 mg/L.
Pond is 1000 gallons and has 5 koi and 6 goldfish. Day time temp is 17c.
Feeding plants with potash and epsom salts has helped green up the leaves
a
little. Anyone suggest how to get the plants into growth. Many thanks. C.