The Firsle FLS series Aquarium Bubble Bio Media Filter fluidized bed Filter is an efficient water treatment equipment, particularly suitable for biological purification in aquariums and small aquatic ecosystems. The core of a continuous flow sand media filter is to utilize the microbial community in the sand for biodegradation and nitrification. In aquaculture water bodies, organic substances such as fish excrement, residual feed, and algal debris are converted into harmless or low toxicity products by microorganisms, effectively reducing harmful substances such as ammonia nitrogen and nitrite, and maintaining the ecological balance of aquaculture water bodies. The quicksand biofilter supports continuous circulation filtration of aquaculture water, which can continuously treat aquaculture water, maintain water quality stability, and reduce the risk of disease outbreaks. Compared to traditional water exchange methods, continuous flow sand media filter reduce water source consumption and wastewater discharge through biodegradation and recycling of water resources, which is in line with the concept of green and sustainable development. The continuous flow sand media filter is suitable for different scales of aquaculture, from small-scale ornamental fish farming in households to large-scale factory farming systems, and can play a role, especially in factory circular water farming, where it is an essential water treatment process.