② Place the net bag in the filter tank, below the filter cotton, above the filter material, or where the water flow impact is frequent.
③ When the protein cotton water purification and adsorption capacity is saturated, take out the net bag and put it into the high concentration of salt water to soak the sewage, soak it for 12 hours, clean it once a month, and it is recommended to buy 2 times to use the portion of the use of the alternating use.