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Frequently asked questions

The Magnum IT (model 298) is a 2" control valve from Pentair Autotrol, built for larger water softeners and filters in commercial, industrial and large residential systems. Instead of a sliding piston, it uses a set of valve discs (sometimes called flappers) to direct water through each stage of the cycle. We stock it in softener and filter versions, with three control options: a Logix 742 timer, 762 metered control, or a 764 duplex controller.

The 742 is a timed controller. It regenerates or backwashes on a fixed schedule, such as every few days, whatever the water use. The 762 is metered. It measures the water passing through and regenerates only when the system has treated a set volume. Metered control usually saves salt and water where usage varies from day to day. Timed control suits steady, predictable use, or filters that just need backwashing on a regular schedule.

It depends on what's in your vessel. The softener version is set up to draw brine from a salt tank and regenerate softening resin. The filter version only backwashes and rinses the media, with no brine draw. It's used with filter media such as carbon, sediment or iron-removal media. If you're replacing an existing valve, match the version and controller to the one you have. If you're unsure, contact us with the details of your system.

The backwash flow controller (DLFC) is sized to the diameter of your vessel. It needs to give enough flow to lift and clean the media without washing it out to drain. We stock sizes for 8" to 14" diameter vessels, each listed with its flow rate, from 1.6 gpm for an 8" vessel to 4.8 gpm for a 14" vessel. Some controllers need a flow control ball (part 1030502), which is sold separately, so check each listing before ordering.

Common signs are hard water getting through the softener, water running continuously to drain, salt not going down in the brine tank, or leaks between cycles. Worn or damaged valve discs are a frequent cause, and the 1040692 disc kit replaces them. You'll need a T50 Torx key for the top plate screws. For a full valve or controller replacement, we recommend a competent installer or water treatment engineer check compatibility and carry out the changeover.