Buy one of these. The box has a pump with a built in floater valve. I used it to setup up a DIY runoff removal system that I just got up and running. It's maybe the greatest upgrade I've done to my grow room. It was easy and kind of fun. Last evening I did an EC correcting flush with 30 gallons of water and it worked like a champ. Plus it's only 28 bucks.
NovelBee 12V 750 GPH Multi Port Shower Sump Pump Drain Kit System:
Buy NovelBee 12V 750 GPH Multi Port Shower Sump Pump Drain Kit System: Sump Pumps - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
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Here's a quick video showing how I set it up:
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