How do I work out the surface area of one end of a 4-inch storm water pipe I am going to use as my filter housing?
You are here: Home » Grow FAQ » Hydroponic system construction » Slab and tray systems, Slow sand/rockwool filter » How do I work out the surface area of one end of a 4-inch storm water pipe I am going to use as my filter housing?
Use the formula pi x radius squared. (3.14 x (2"x2")) = 12.56 square inches for a 4" pipe
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