Perhaps I should have clarified that statement by indicating that it applied to eco-system ponds. Eco-system ponds are considerably more likely to establish a biochemical equilibrium than a dedicated Koi pond due to the presence of richer diversity of micro- and meio-organisms, both sessile and planktonic.
An assumption is made here that a pond has proper flow rate and adequate filtration, mechanical and Bio.
Most of my customers ponds are only tested once......at the age of 1 year. This is to establish a parameter base-line that can be referred to, if needed, in the future. Those customers that request scheduled testing receive same on a quarterly (seasonal) basis. My own current personal pond has only been tested twice in a 10 year span. The parameters just do not vary beyond the expected diel and seasonal ranges.
Dedicated Koi ponds,,due to the purpose of their design, which is focused on viewing, do not have this diversity or the ability to support it. Biochemical equilibrium in a dedicated Koi pond is considerably more fragile if it is indeed ever naturally achieved So frequent and possibly more extensive testing is mandated of these systems.
Forgive me for this discrepancy in my thinking, but I don't mentally associate dedicated Koi ponds as being ponds, but rather viewing pools. Comparing dedicated Koi ponds to eco-system ponds is 'Apples and Oranges'.
Thank you Meyer for your in depth answer , I have to agree that dedicated koi ponds are somewhat like viewing pools , this is where the mix up Lies that is why I asked you to clarify what you were saying
It is quite easy to tip the biochemical equilibrium if your not on the ball and are on top of things, as such this is the reason why we carry on with partial water changes on a regular basis throughout the winter months.
This w we achieve by using the trickle method of adding water through a dechlorination filter using the ambient temperature of the ponds water to warm the trickle as it runs in .
It may take alott longer doing it this way but correctly done you can get away without effecting the temperature by between .1 or .2 of a degree of temperature .
.Sometimes in the winter many of us think we are daft but the dedication pays dividens in the spring.
Because of this weve not lost one koi to the winter months since we moved outside and dont aim to start doing so either at the last water change we had 9c and finished with 9c even though the outside air temperature was around about 4c .
All we need do is empty the vortex twice to give us the correct amount of water to replace then hook everything up and go indoors popping out periodically to check on the pond water level until the pond is topped up.
Then all we need do is store the hose pipe away and do the same with the dechloination unit and we are finished, I'd say the total time outdoors during the whole proceedure is around about half an hour , then back indoors to a nice warm front room nd a hot milky coffee
Dave