The majority of issues with resin exiting a softener tank is
1: System plumbed in backwards. The system can function if it is installed backwards but under high flow conditions (above 3-4 gpm) the resin will hit the top screen and since upper screens are really nothing more than diffusers and shipping protection (system being laid down), they are not really intended to stop media like a bottom screen is.
2: Cheap bottom screen, very common with the internet guys who are desperate to save a buck. High end heavy duty are made in either the USA or Italy. They cost 30X more than a cheap import screen does. This is a critical component and while 30X may sound like a lot, when you consider that a piece of garbage screen costs about 25 cents, it is not really that expensive to do it right. But when you are going to lose half your sales overnight if another online company beats your price by $1, this is an easy place to shave off a few bucks.
3: Shipping damage. Many online companies ship units completely assembled through UPS, this can work sometimes but the abuse UPS puts on the equipment is amazing.
If you want to put something after the system, a simple Y strainer is usually adequate and can go for decades without service.