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Цитат на: https://www.allaboutkoi.co.uk/orp-t-34.htmlQuick Summary of ORP levels as applied to koi ponds:At readings of below 150, significant improvements to the filtration of the pond should be made as soon as possible to avoid massive fish health problems.At readings between 150 to 200, fish health will not be marginal, with green water and slime algae a usual occurrence, especially in the absence of UV lights.At readings between 200 to 250, fish health will usually be okay, but not optimum, and stringy algae or blanket weed will normally be a problem.Readings between 250 and 400 reflect good to superb water quality, and prevention of fish health problems by water excellent water quality control. The higher end of this range is preferred over the lower end for dependably good fish health and fast fish growth.Readings between 400 and 450 reflect the use of either potassium permanganate or ozone to increase water quality by addition of a chemical oxidant to the pond to oxidize the various dissolved organic compounds and solid waste materials on the pond bottoms and in the filter systems. Readings in this range usually do not harm the useful bacteria in biofilters if the length of time is less than 30 minutes in this range.Readings between 475 and 550 reflect active potassium permanganate levels which should kill fish parasites without harming the fish, and quickly oxidize pollutants, provided the fish exposure is only a few hours per week. Water with ORP in this range should not be circulated in biofilters since the useful bacteria may be oxidized significantly.Readings between 550 and 600 should not be continued for more than 15 minutes because of likely damage to the gills of fish.Water with readings above 700 will sterilize a system of all life forms in about 10 to 15 minutes.
ЦитатHowever, ozone gas, which is directly dissolved in the water, is very poisonous for fish, invertebrates, and humans. Therefore, you must be certain you are adding just the right amount into a contact column (not the main aquarium) and the water is filtered before reaching the main aquarium--activated carbon is effective for filtering because large quantities degrade ozone byproducts.
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