(General Hardness) – What is GH?
Hardness is a measure of the sum total of minerals dissolved in the
water. Water can be either ‘soft’ or ‘hard’ depending on the amount
of dissolved minerals, (the more minerals the greater the hardness)
I am sure we have all had experience with GH – lime scale in your
kitchen kettle for example……..
Why do I
need to test for GH?
minerals that make up the hardness of the water are all essential
for the biological processes that occur within the pond. If the
hardness is too low then these processes cannot function
sufficiently, and the pond will begin to stagnate. Regular testing
is essential, as the GH will decrease as these minerals are used up
by the pond life.
the correct GH levels for my pond?
This test kit
measures GH in odh (where one degree = 17.8 PPM CaCO3). Maintenance
of a level of at least 8odh will ensure the biological processes f
the pond can continue to function. The ideal level lies between 10
should I do if the GH level is wrong?
Test the GH
of your tap water (or spring water etc). If it is above 8odh then
regular water changes should insure that the GH level is topped up.
If your tap water is below 8odh then use Koi Care & Minerals Up.
This can also be used to boost GH in healthy ponds. If the GH value
is low it is vital to check the PH and KH of the water as well.
Alkalinity) – What is KH?
KH, is also
known as Total Alkalinity or Carbonate Hardness and is a measure of
the buffering capacity of the water in your pnd. The buffering
capacity refers to how well the pond can resist changes in PH.
we test for KH?
ponds tend to acidify over time. This decrease in PH is due to the
releae of organic acids by he fish and the release of acidic
substances by the beneficial bacteria in the pond and your
filtration units. The buffer in the pond counteracts this change by
effectively ‘mopping up’ these acids preventing the natural drop in
PH. If the pond is allowed to drop in PH your fish will become very
excessive algae can show large PH fluctuations on a daily basis.
This change is prevented if there is a sufficient KH level. This is
why it is so important to regularly check and maintain the KH as it
will eventually become exhausted……
the correct KH level for my pond?
This test kit
measures KH in odh (where one degree = 17.8 PPM CaCO3) It is
essential to maintain a minimum of 4odh at all times. A KH of
between 6 and 8odh is more desirable.
What do I
do if my KH level is wrong?
the KH level in your tap water (or spring water etc). If the level
is above 6odh then regular water changes should keep the KH value in
the pond topped up to a reasonable level. If the KH value is below
6odh then perform water changes and boost the KH of your pond using
Koi Care KH (Buffer) UP. To maintain a healthy KH level in your pond
regular additions of a good quality Clay. If you do have a low KH
level it is vital to regularly check the pH of your pond to ensure
it has not dropped too low.