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My 250 gl tank has a DIY filter.
NORMAL FUNCTIONING:
When the pump is running, water is moved to the tank in the low diameter tubing, and spreaded in the bottom by the holed tube. This system elevates poop and many debris up into the water and then are drawn by the overflow on the left side of the tank. Water passes thru filtration system and goes to the sump.
POWER/PUMP FAILURE:
Pump stops, some water comes down from the overflow and is stored in the sump until power comes back. The one way check valve closes and water in the low diameter tube doesn't come down.
WATER CHANGE TIME:
Pump is turned off. Ball valve is opened and (by syphon force) water is drawn from the tank to the drain. When desired level is reached (25, 15% etc...) ball valve is closed. Sump is filled with new water and pump is powered on again.
NORMAL FUNCTIONING:
When the pump is running, water is moved to the tank in the low diameter tubing, and spreaded in the bottom by the holed tube. This system elevates poop and many debris up into the water and then are drawn by the overflow on the left side of the tank. Water passes thru filtration system and goes to the sump.
POWER/PUMP FAILURE:
Pump stops, some water comes down from the overflow and is stored in the sump until power comes back. The one way check valve closes and water in the low diameter tube doesn't come down.
WATER CHANGE TIME:
Pump is turned off. Ball valve is opened and (by syphon force) water is drawn from the tank to the drain. When desired level is reached (25, 15% etc...) ball valve is closed. Sump is filled with new water and pump is powered on again.




