Thursday, December 12, 2013

Yogas update 12-12-13 from Indonesia. Good news on the waterfront.

It cost less to make a cement pond in Indonesia than it does to make a liner pond here in the US of the same size.

Hi Dr. Novak,

How are you? Hope everything is going well. I've been observing the ORP and it seems my pond has an ORP of around 350-400 lately. It had once dropped to 300, but that was only when I did a thorough cleaning of the entire mechanical filter chambers (brushes and japmats). As a matter of fact, right now the ORP meter is reading between 410-420. This worries me since I have read somewhere that an ORP of 400 or more only happens when certain oxidation chemicals are added and if left that way it will kill bacteria’s in the pond. Is this correct? Is it possible to have an ORP reading of 400++ without administration of any kind of chemical? Is an ORP of 400++ harmful to bacteria? What ORP value would you advise me to maintain, and what must be done to achieve that? Btw, it has been raining heavily also for several weeks now. I've read your post on ORP, but couldn't quite understand it. I recall about positive and negative ORP and if not mistaken a negative ORP would be preferable. But I'm not quite sure I understood correctly.

Thank you Dr.Novak, hope to hear from you.

Best regards,


Don’t even worry about a redox of 410-420mV; bacteria are very residual and it will take a considerably higher redox than what you are experiencing to kill them. Remember Tridacna Clams can take a redox of 700mV and have a symbiotic algae living in their mantles that continues photosynthesis at those high mV readings. In fact most saltwater hobbyist keep their aquariums at a 375-475 mV reading all the time with no harm to their animals or invertebrates and that includes the bacteria.

Okay, hears what you have… VERY CLEAN POND WATER NOW UNLIKE BEFORE with your old filtration system!  You must get use to the AFS, and all those that act like they know everything about ponds and filters…well they really don’t! To get a redox of plus 400 mV you must have an ECO friendly filtration system that utilizes bacteria, and that bacteria then does not add more wastes in the form of ions than what is naturally incoming into the system by outside insults. In other words the AFS has more ion takers than producers. Conventional filters always add something to the ECO-system that really doesn’t belong in that system. So the only way to get rid of it, is through water changes. You are now using an ion filter unlike those that don’t use an AFS they must through water changes and lots of them at that to achieve what your doing with so little outlay. Just enjoy the fruits of your labor and your Koi! Keep up with what you are doing and be proud of your achievements. You trusted me and made the right decision by getting rid of what you were told was good for something better.

The chief enemy of good is better! I know this is very confusing to you because it does go across the grain of what everyone has brainwashed you into believing all these years about that: Only very expensive equipment is the only way to have ├╝ber clean and good pond water for our Koi’s. It is one way, but unfortunately not the only way!

Happy ponding,


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