水草情迷

Want to set up a central filter system for many individual betta tanks by using a filter cylinder. Intend to make allowance for future increase in the no. of tanks.

Want to know which brand/type of filter cylinder(s) have the option to adjust water in/out flow??
And how about their prices & qualities?

控制摩打轉速的應該冇呀. 多數都係控制入水水流, 去改變流量既.

If do not control the 摩打轉速 but just block the 水流 in/outflow, will the motor got burn ??