It will shut up very easily and there will be a flood. Now 100 percent honest. I have a huge 220 liter aquarium with lots of fish in it. But both times I had a flood within 24 hours after the water flowed through. It became clogged so water could not and could not flow through it. Therefore, be very careful when using this product. I can no longer use it. I used it in my swamp. BE VERY VERY CAREFUL. But if you don't have a lot of fish and don't have a lot of fish waste, you can or should be fine. Or, like me, I have a lot of fish and a lot of fish waste, check daily whether water is flowing through. Because if it's clogged with garbage. water will accumulate.
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