Bait tank drain size for 500 and 750 GPH twin port pumps

[CT]

Hi folks,
I'm working through the shopping list for fitting out the new live bait tank and am wondering what outlet drain sizes people are running for what pumps? My old pump was a 750 GPH with a 50 mm drain outlet on the tank from memory. It drained very well and the pump never caught up with it.

The new bait tank is about 30 litres and I'm planning a twin port pump fed off a through hull pickup, auto fill while underway.

Thanks
Craig

[Noelm]

For a forced pickup you will need a decent drain, and put some sort of mesh over it, because small live baits will just go out with the over flow, giving you quite a surprise when you get to you spot, open the tank lid and find no bait inside.

[Dignity]

I had one 25mm outlet and it wasn't enough. Fortunately I had the option of a second outlet through a mistake I'd made previously so used it and now it's fine and I don't need any mesh.

[gazza2006au]

Hey CT Bilge pumps as bait pumps usually pump to much water i often have 20 to 35 litre bait tanks i find even a small johnson or rule pumpm of about 450gph is to much as in to much water flow for 15cm yakka's also height also plays a part on pump head height the higher u go with a bait tank the less it will pump in volume

i usually run 1" thru hull skin fittings with a 19mm tap on the pump to slow down the volume the last thing u want is to be pumping a lot of water thru a tank it'll only bring the bait to the surface and make them swim harder might be ok if u pick up a batch of slimies but anything else yakka's or squid you'll work them hard

for me a flow of about 2 litres per minute is perfect for continuous running pump in a 35 litre tank with 15 yakka's thats about 120 litres per hour or 1 water change over 20mins is plenty some times i shut the pump off after a water change and they are good for 1 hour it keeps them lively and active