In summary: You could buy a water pump for aquaria (see image), and they are pretty silent - but that won't solve your problem. Every time it drains the holding basin (and it will) the pump will lose prime and will have to be shut off, refilled and reprimed.You should try to estimate the flow rate you need by timing the pump you have now. Then you can select a pump based on the actual requirements of your sump.
#176
gloo
261
2
oh no worries... i have the two main pumps by liberty pumps (good brand), the battery back up pump, and the water pressure sump pump all ready to take over.