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Ok here is my simple designs for a livewell. First here is the 30 gal drum and next is the 15 gal drum.Basically you will have to choose which design will fit your needs. Full standing barrel or the laying down with dividers.You can purchase a premade tank with dividers installed but it will be expensive.I hope this helps you with your choice.
Can be assembled with PVC from lowes or homedepot. Airator is just a length of PVC with a cap on end and multiple small holes drilled into to spray water.Discharge tube is the spay except for larger holes to allow water to exit a little faster than its coming in.As for dividers you can use PVC panels cut to diameter of drum with holes big enough for water to pass thru freely and not allowing bait to intermingle(example Choffers will eat the other bait shrimp mullet).I will have to eventually get a drafting or cad program to draw better with measurements.But you get the Idea!
If you look at my boat picture below wife and me you will see the top of my live well I made into centerconsole.When I have more time I will make up the installation plans for live well pumps .For transom,thru-hull or side wall.:grouphug