The fish tank of 25X25X40 has 8 small fish, and there is an oxygen absorbing device. do you want to change water? How often? Just change it once a week,By the way, wash and filter once a week,Change 1/3 of water each time,You can also suck fish with a tube at ordinary times,Use a tube for changing water,Siphon principle if there is a filter device, wash the filter Cotton frequently,Don't change water often,My fish tank is,Don't change water.Goldfish or tropical fish,If it's goldfish changing water once a week,Once a month.If tropical fish change water, clear the tank.
Which is good for bag filter and filter cartridge? 1. the hard filter material of the filter cartridge or filter bag is folded to form a cylinder,No skeleton,Short,The spacing between cylinders is large,Thoroughly cleaned,No secondary pollution.2. the bag is sewn into a filter bag with soft filter material,The skeleton welded into the steel bar (commonly known as the dragon skeleton ),The filter bag is thick,The filter material is long polyester fiber and its post-treatment materials are mostly single-layer ordinary industrial polyester cloth.3. filtration principle surface filtration principle: the dust of filter cartridge does not go deep into the filter material.Bag filter dust deep into the filter material,The dust layer is established on the outer surface of the filter material to maintain the dust removal efficiency.1.The dust of the bag filter goes deep into the filter material,Some dust is blocked from the outside of the dust bag,The purified air is discharged through the fan inside the filte