So the water pressure and volume dropped significantly over the last month or so. Or maybe it just got so low that it's more noticeable now, but the culprit is definitely the water softener. Took it all apart and found the bottom filter plugged up nicely. After cleaning all the gunk out of the tanks I've decided to replace the resin. Stock from Sears is expensive but I see a lot of replacement type resin. The repair manual says 'high capacity resin' but I've found only regular and fine mesh resins. Don't exactly know the difference. Can I purchase the correct resin here?