Koi Know How - Using algae controls
Without doubt, nuisance algae tops the list of UK pond owners'
complaints. Green water needn't be a problem for any pond owner who
has recirculating water in their pond since ultra violet units
(adapted from the food processing industry) have been introduced to
the pond and aquatics industry.
- As should always be the case with responsible pond keepers who are
guardians of their fish, we should identify and address the cause of
blanketweed in our ponds and only then, having tried preventative
methods, unlock the treatment chest and try to counter it with a
- The reason why we should make our own preliminary investigations
into the cause of the blanketweed (concluding on either light or
nutrients or both - as every pond's environment will be different)
is that there is a cost (not just financial) when using a counter
measure or treatment against algae.
- As described earlier in this series, any compound that is added to a
pond will affect the pond's chemistry and depending on a number of
factors, will have an effect on our koi.
- The active chemical is broken down over several weeks by bacteria
and particularly UV light, reducing its concentration steadily to
levels which make it ineffective against blanketweed.
- The fact that it is broken down by bacteria over a matter of weeks
should make it apparent to us that additional aeration during
treatment should be applied to the pond.
- These chemicals have very little effect on water quality and because
they work by stealth, controlling and reducing algae growth (rather
than killing it), additional aeration during its application is not
as vital for the well being of the pond as when an algicide is used.
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