Problem

Possible cause

Simple solution

Algae build up

Too many fish and overfeeding cause surplus nutrients in water

->

Take out fish/feed less/use Oase pond clear or algae stop

Algae build up

Fallen leaves and decayed plant matter

->

Remove leaves and dead plants/suck out, use Oase sludge vacuum and/or pond filter

Algae build up

Too few plants/inappropriate planting

->

Change planting

Algae build up

Shallow water (water warms up more, so more algae growth)

->

Use pond clear or algae stop, change water

Algae build up

Pond newly set up, balance may not be right yet

->

Remove algae or suck out with Oase Pondomatic vacuum cleaner

Algae build up

Carpet of algae (due to string algae)

->

Remove with pond pliers/net/suck out with Oase Pondomatic vacuum cleaner

Murky water

Floating particles

->

Use Oase pond filter

Murky water

String algae

->

Use pond filter with UVC light. Apply pond clear

Murky water

Too many fish or overfeeding

->

Remove fish with pond net, feed less

Odour

Pond is out of balance

->

Partial water change

Loss of water

Normal evaporation or evaporation through stream

->

Top up with water (preferably collected rain water)

Loss of water

No capillary barrier (seepage through to adjoining planting or earth)

->

Build capillary barrier, to create a barrier between water and garden planting

Loss of water

leak

->

Repair leak

Death or illness of fish

Pests (bacteria, viruses, parasites)

->

Use filter with UVC appliance

Death or illness of fish

poisonous matter

->

Use filter with UVC light. Partial water change