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I summarized on the understanding and filtration methods to make good water quality, and the utility value of electrolyzed reduced water and acidic water in fish keeping.
There are mechanical filtrations including prefiltration and bag filter, biological filtrations including under gravel filter, canister filter, tricle filter (wet/dry filter), chemical filtrations including molecular adsorption resins, ozone, protein skimmer, activated carbon, peat moss and UV sterilizer to get the good water quality in fish keeping.
Electrolyzed reduced water and acidic water can be utilized in regulation of pH without chemicals for fish breeding. Also, electrolyzed acidic water can be very useful to prevention of propagation in disease because its effect of sterilization.