Adding osmosis in a koi pond has been described many times with great praise in the various British articles. Koi swimming in a mixture of RO permeate and tap water are more vital, grow faster and the colors stay softer!
But why RO? Ro is in itself no more than a device that converts tap water to H2O alone. In other words, very soft water comes out of the osmosis device. An osmosis device is actually a diaphragm that squeezes tap water through this diaphragm by means of a pump, so that only the water ion (h20) can pass through without salts, calcium, kh, Fe, etc. This gives you a water jet that you can perfectly use in koi pond.
But why? In japan the koi swim in mudpounds that also house very soft water. In these mudpounds, TDS values of up to 30 ppm are measured. TDS (totally dissolved solids) is a value of the total dissolved substances in the water. This can be measured with a TDS meter. In this region (zwolle) a value comes out of the tap of around 290. This is very clean water with a kh of approximately 4-5 and a gh of approximately 6-8.
Now you can measure the pollution in your pond with a tds meter! The higher this value is, the dirtier your pond CAN actually be. Just a math: you have a kh of 5 and a gh of 8. This is in tds values: 5 (kh) x 18 (value tds, is a given) + 8 (GH) x 18 = 90 + 144 = 234. The number of 290 brought to less by 234 is 56. So now there is still 56 dissolved substances in our tap water. This can be, for example, calcium, iron, etc. and even more substances. We will not go into this further, otherwise this will be a very long story. 56 is very little and it can therefore be said that our tap water is very pure. If we translate this to the pond we can measure the pond water. So you measure your kh and gh, so you multiply this by 18 and deduct this from your tds value. If this fluctuates around 100, it is still acceptable ‘koi water’ if this is more you will have to change more water or consider a better filter system.
We are actually wandering a bit from the OSMOSE phenomenon. But with osmosis water you can send the TDS to a value where the kois swim in the mudpounds from Japan! That would be nice! Your pond with values that we also measure in Japan! That is possible with Osmose.
The values in Japan are in the mudpounds around 30-100! 30 is extremely low, but around 100 is very nice to have in your koi pond. A few years ago we went to momotaro. During this koi hunt he invited us to have a bite to eat, where he said that his ponds are all running on a TDS of around 80! He doesn’t do this for nothing! The koi stay better in color, beni is much better in development, fish grow much faster etc etc. Mike Snaden of Yume koi from the UK has also written various articles about this (very worthwhile to check out on his site how he against osmosis!).
By means of Osmosis you can top up the water in your pond with a TDS of 0-5. So now you can start sending your pond water a tds value of around 100! Everything stands and falls with your pond installation and quality of your koi. Of course you cannot generate a TDS value of 100 if a multi-chamber filter for 10m3 is running on a 30m3 pond with 30 jumbo’s in it.
A wonderful value is to obtain a KH of around 3 and a Gh of near 0! In the first few weeks, your osmosis will be very busy to lower your tds value to, for example, 150 or perhaps to 100. After that, the osmosis system will only have to jump in when the TDS goes up again. What we do is add approximately 70% osmosis and 30% normal tap water to maintain a TDS of 100-130 ppm.