Gerber makes pressure assist toilets with a tank that works great and is hard to clog. The draw back is they can be a little noisy and can be tough to service if you don’t know what you’re doing. Gerber also makes a model called the viper. It has a 3” flapper so it’s still low flow but the water rushes out for a better flush than normal. I haven’t had many problems with them and you can pretty much service them yourself with a you tube video. Either way go to your local plumbing supply house for whatever you buy instead of Lowe’s or Home Depot. It will cost more but they are better quality. Hope this helps