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Reverse Osmosis / RO Systems and Usage TalkTalk about the use of Reverse Osmosis in the Koi pond. Ask your questions here.
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Top Poster: markf1fan (4,877)
Cool - my mate Andy (finkoi on the forums) has had this running for a while and has now set up a recyling pond water RO unit to. You can usually find him on the A4 forum if you wanna pick his brains about how he has it all set up.
Not seen it in the flesh myself yet and he keeps telling me to wait a while till he's run a full years test but the principles look easy and a no brainer.
Lashed the first one up on the Growing On tank, yet more holes in the Drum
Acid test or more appropriately alkaline test added 10ml of bicarb and 5 minutes later the pH had picked up from 7.35 to 7.38.
Greg - Totally agree that recycling seems to be the way to go, there were a load of fittings down at Yume last week so guess Mike is finally going to get his up and running, Andy is doing a great job in doing the expensive hard work in seeing if things are practical.
Historically with manual Bicarb dosing Ive always tended to feel the need to take a cautious approach to the KH and run at around 20-30 ppm this gives me a pH of around 7.3.
This tends to give a bit of a pH swing, firstly when you add the bicarb and secondly during the day when the natural reaction is for the pH to rise.
Iím setting the controller up at a pH of 7.00 with .02 variation between High and Low, Iím guessing that to support this during the day (when the pH wants to naturally rise) I will end up with KH of 5-10ppm. At night (when the pH naturally wants to fall) the controller comes into its own adding small amounts of bicarb to add a tad of KH and maintain the pH when needed.
The showers on the growing on system where Ive added the first controller burn little by way of KH and the water turns over every 10 minutes so there is very little time lag involved between adding bicarb and it being detected on the controller,
Theory is that it will be easier to run stable pH of 7.0 than one of 7.3.