Hot Spring Spas FreshStart Clean Screen Water Pre-Filter 76028 - Premium Spa Water Filtration System for Crystal Clear Hot Tub Water | Perfect for Home Relaxation & Backyard Spa Maintenance

We used this to fill a 575 gallon hot tub from our well which has pretty hard water. We use a conditioner in the house but our hose bibs are not conditioned. This pre-filter was easy to attach to the hose and it worked really well to reduce the hardness so we didn't have to mess around with adding softener to the tub. It was a real time saver when we started up our hot tub for the season. We'll definitely use it whenever we add water to the tub. The great thing is that it is rated for up to 5 complete fills of our hot tub!