Just my opinion bud but I've used super bait tanks for years and years guiding with 0 complaints. I've tried and used just about every brand of bait tank on the market and NONE have compared. Ron vest is owner of super bait tanks and a pleasure to deal with, good guy. I have absolutely no trouble keeping bait healthy as long as I want even thru the summer months. Keeping in the heat does require more babying of the bait so too speak to hold any length of time. Super makes a 20 that's pretty small, a 30, a 40 and a 50 or will custom build whatever size you prefer. Ron stands behind his product which means a lot too me as well. I myself prefer filtartion. Shad poop and pee in the water and shed scales and in turn emits ammonia into the water. No filter of any sort and the bait is gagging in its own waste and scales. No filters will work for short lengths of time but to keep them healthy for any length of time other than just several hours of a days fishing, I recommend a filtration setup. Not to knock any bit of info duayne gave as several guys have quit using filters, it's just my preference. Fishing over 200 days a year I have alot better luck with it than without.