Water Softeners & Combos

Softeners, salt-free conditioners and combo systems for the whole house.

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8 Products

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Answer four quick questions and we'll narrow this collection down to your best three.

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Ordering from Rein Water

What to expect

  • Ships direct from the manufacturer

    Every order is packed and shipped by the brand that makes it. We submit your order to them within 2 business days.

  • Estimated delivery on product pages

    Brondell, Crystal Quest and Waterdrop product pages show a dated delivery window under the buy button before you order.

  • Returns by brand

    Each manufacturer sets its own return window and restocking fee. Check the terms for your brand before you order.

    Return terms by brand

  • Tracking as soon as it ships

    We email your tracking number within 1 business day of the shipment leaving the manufacturer.

Find your fit

Which softener setup fits?

The WaterWorld USA softeners here are sized and priced by quote: request a quote from the product page with your delivery address, household size and hardness figure, and we reply with the system price and delivery together.

Send us your ZIP code and we will help you size the system.

Get a free water analysis

Those are signs of hard water. A hardness test in grains per gallon confirms it and gives the figure you size a softener from.

Water test kits

A combo pairs the softener with a filtration stage ahead of the resin tank. A softener on its own treats hardness only.

Whole house filters

A softener needs a resin tank, a brine tank and a nearby drain. Cabinet models put both tanks in one housing.

See all softeners
Take the quick quizRead the buying guide

At a glance

Softener options at a glance

System type What it does Who it fits
Softener, timed regeneration Exchanges hardness minerals in a resin tank and regenerates on a set schedule. Homes with steady, predictable water use.
Softener, metered regeneration Regenerates by the amount of water used, which saves salt. Homes where water use varies week to week.
Cabinet softener Resin tank and brine tank in one housing. Homes short on floor space.
Softener combo Adds a filtration stage ahead of the resin tank in one system. Homes that want softening and a filtration stage together.

Size by household size and your hardness in grains per gallon; each product page lists grain capacity and flow rate (GPM). A softener is installed on the main line, usually next to the water heater, with a drain for the regeneration cycle.

How to choose a water softener or combo

A softener exchanges hardness minerals for sodium or potassium in a resin tank and regenerates on a schedule or by metered use. It is installed on the main water line, usually next to the water heater, with a drain for the regeneration cycle and a brine tank for salt. A combo pairs the softener with a filtration stage in one system. This collection holds softeners from WaterWorld USA and Waterdrop, including a cabinet model, app-controlled valves and an air-injection system for iron and sulfur treatment. Softened water reaches every fixture downstream of the unit.

Who it is for

Homes with hard water: scale on fixtures and kettles, spotted glassware, stiff laundry and short appliance life. A hardness test in grains per gallon confirms it.

What to compare

  • Grain capacity: sized from your hardness figure and household size; the product page lists the rating.
  • Flow rate (GPM): matched to your bathrooms so pressure holds when several fixtures run.
  • Metered or timed regeneration: metered units regenerate by water used and save salt.
  • Combo or softener only: a combo adds a filtration stage ahead of the resin tank; a softener treats hardness alone.
  • Space and drain: a resin tank, a brine tank and a nearby drain; cabinet models put both tanks in one housing.

WaterWorld USA systems are quoted with delivery. Request a quote from the product page and we confirm the delivered cost before you commit.

Common questions

Size by household size and your hardness in grains per gallon. A water test gives the hardness figure; product pages list grain capacity and GPM.

They are quoted. Request a quote from the product page with your delivery address, household size and hardness figure, and we reply with the system price and delivery together.

A softener on its own treats hardness only. A combo system adds a filtration stage for taste or sediment; see also the whole house and reverse osmosis collections.

A water softener removes calcium and magnesium by ion exchange and regenerates with salt, so the water tests soft. A salt-free conditioner uses no salt and leaves the minerals in the water, changing their form so they are less likely to stick as scale. If you need soft water by test, choose a softener.

Crystal Quest's salt-free water conditioner for homes is in Whole-Home Filtration, and its 20 to 100 GPM salt-free units for larger buildings are in Commercial Water Systems.