Softeners, Filters and Reverse Osmosis for Desert Hills Hard Water

Whole-house filtration: what it does and what it does not

A whole-house filter treats water where it enters the home. A sediment filter catches sand and rust. A carbon filter reduces chlorine taste and odor. Neither removes hardness, which is dissolved calcium and magnesium, so a filter alone does not stop scale. Choose by the problem. Cloudy or gritty water needs sediment filtration, a chlorine taste needs carbon, and scale needs a softener or a conditioner. A water test turns a guess into a decision, and a lab test is more reliable than a strip.

Reverse osmosis for drinking water

The storage tank holds a few gallons, and the dedicated faucet usually sits on the sink deck. Pairing reverse osmosis with a softener is common, since the membrane lasts longer when hardness is removed first. Ask where the drain line will tie in and how the tank will be sanitized when filters are changed. A reverse osmosis system pushes water through a fine membrane at one tap, typically under the kitchen sink. It reduces dissolved solids and many other contaminants, and it feeds a small storage tank and a separate faucet. It wastes some water in the process and needs filter and membrane changes. Ask the plumber about the annual replacement parts and the waste ratio before you decide.

Water softener: how it works

A softener swaps the calcium and magnesium in hard water for sodium or potassium on a resin bed. Periodically it regenerates, flushing the bed with brine from a salt tank and sending the rinse to a drain. Hardness is measured in grains per gallon, and the unit is sized from it and from household use.

For its Anthem system, EPCOR Water Arizona listed hardness near 18 grains per gallon in a 2025 report. That is very hard water by common scales, though hardness depends on the supplier and the source at your address. Check your own provider report or test the water. Scale also shortens heater life, which the heater repair page touches on.

Signs of hard water and how to test it

Strips are quick but approximate, and the numbers can drift with age and light. For a reliable value, ask your water provider for its current report or send a sample to a lab. Test both the hot and cold side, and note whether the home has a softener already. White crust on faucets and showerheads, spots on glassware, stiff laundry, dry skin after a shower and a heater that fails early are all common signs. A quick test strip gives a rough number. A lab report gives a better one. Water treatment and water conditioning are used loosely. A conditioner changes how minerals behave and may not remove them. Ask the plumber exactly what the system does to the water.

Under-sink and drinking water filters

A countertop pitcher is the simplest option, and a three-stage under-sink unit gives a larger volume and a separate tap. Whichever you pick, look for a published certification for the contaminants you care about, and keep a note of the last cartridge change so the next one is not missed. A small carbon filter at the sink improves taste and reduces chlorine without the cost of a full system. It needs cartridge changes on a schedule, so a calendar reminder is worth setting. Hard water also shortens the life of water heaters, and the water heater page covers what a new tank needs. Check that the faucet and filter housing do not drip after installation, because a slow leak under a sink often goes unseen.

Softener install and repair

Most softener problems start with salt, power or the drain line. A tripped breaker, a clogged drain tube or a stuck bypass valve can all stop regeneration, and each is a short fix. Ask the plumber to write down the settings so you can compare them if hardness returns. A softener needs a drain, an outlet, a bypass valve and space for a brine tank. The plumber sets it up, programs the hardness and regeneration time, and teaches you to check the salt. Service calls are usually for a stuck valve, salt bridging, a failed controller or resin that has worn out. A salt bridge is a crust that forms in the brine tank so the unit runs without salt, and breaking it is a simple fix.

Sizing a system to the house

Size comes from two numbers: grains of hardness and daily water use. Multiply gallons used per day by grains per gallon, and the result is the grains the softener must remove each day. A larger resin tank regenerates less often, which saves salt and water over time. Households with a high count of people, or with irrigation fed from the same line, need a bigger unit. A plumber can also advise on bypassing outdoor taps so the softener is not wasted on the lawn. Location matters. The unit needs a drain within reach, an outlet, room for a salt tank and a spot where a leak will not cause damage. Garages work well, as long as the equipment is protected from direct sun and from freezing.

Salt, resin and routine care

Pellets generally outperform rock salt because they leave less residue, and a tank kept half full is a good rule of thumb. Clean the brine tank once a year if sludge builds up. If you travel for long periods, the unit can stay in service, but check it on your return.

Salt type matters less than keeping the tank at a good level. Check it monthly and break up any crust. Resin lasts for years but wears faster with chlorine and iron in the water, and a performance drop usually shows first as scale returning at the tap. A softener adds a small amount of sodium, and some households keep a separate unsoftened drinking tap or a reverse osmosis tap. Ask the plumber how the system is plumbed so outdoor lines and the drinking tap are handled as you prefer.

Treatment answers worth having before you book

Water treatment decisions depend on what is in your water and what bothers you at the tap. The short answers below cover what each system does and does not do, and they help you decide what to ask for. Share a test result when you call so the plumber can bring the right equipment. Keep your last water report with the equipment manuals for future reference.