Direct answer: “Regeneration” means two different things on HALO equipment. On a HALO 5, it is a short, salt-free backwash: the installation manual says the system “will automatically perform single system regeneration for ten minutes each week,” and HALO’s FAQ splits that into 6 minutes of fluidizing the media bed and 4 minutes of re-compaction. On a CK10 softener (and the Hybrid, which uses the same valve manual layout), it is a full salt regeneration: brine fill, backwash, brine draw, a second backwash and rinse, started by a meter or a day count at a set hour, 2:00 a.m. by default.
Publisher boundary: Water System Guide is an independent research publisher, not a HALO dealer. This page uses the HALO 5 installation manual (Rev.3326), HALO 5 quick-reference guide, HALO vacation guide, HALO FAQ page, CK10 manual (November 20, 2024) and Hybrid manual (January 7, 2026), reviewed October 15, 2026. Settings for your system should come from your installer and your water test.
HALO 5: a weekly backwash, not a salt cycle
The HALO 5 is a filtration and conditioning system. It has no resin and no brine tank, so it never uses salt. HALO’s FAQ explains why it still regenerates: it “regenerates once a week. This is not so much to clean the system but really to reset the media bed and prevent ‘channeling’,” which it describes as water finding “the path of least resistance” through the media and avoiding contact with much of the carbon (HALO FAQ).
The key HALO 5 numbers from HALO’s documents:
| Item | HALO’s figure | Source |
|---|---|---|
| Cycle length | 10 minutes | Installation manual, FAQ |
| Cycle steps | 6 minutes fluidizing, 4 minutes re-compaction | FAQ |
| Default frequency | Once a week | Installation manual, FAQ |
| Backwash flow, H5-100 | Approximately 3.5 gallons per minute | FAQ |
| Recommended interval by household | 11 days (1 person), 9 days (2–3), 7 days (4+) | Quick-reference guide |
The installation manual’s overview states the weekly ten-minute cycle (installation manual, PDF page 3). The quick-reference guide sets “days between regeneration cycle” by household size and calls those intervals “recommended unless otherwise requested by homeowner” (quick-reference guide). The two are consistent for a household of four or more; smaller households can run longer between cycles.
Water use, our arithmetic: 10 minutes at about 3.5 gpm is about 35 gallons per cycle for an H5-100. Over 52 weekly cycles that is about 1,820 gallons a year. HALO’s FAQ says the discharged water “is safe for plants, pets, and wildlife.” Larger HALO 5 sizes may backwash at different rates; HALO’s FAQ gives the rate only for the H5-100.
Setting the HALO 5 regeneration time and interval
From the quick-reference guide:
- Set the time of day. Hold SET for 5 seconds, set the hour with the arrows, press SET, then set the minutes.
- Set the regeneration time. Hold SET and an arrow together for 3 seconds until the display flashes, and choose “a time when minimal water is being used.”
- Set days between regeneration. Use the household-size recommendation above.
- Verify P7. In the next menu, P7 should be set to 99. If you see 7 instead, the guide says to change it to 99.
- Confirm. The main screen toggles between the time of day and days until next regeneration.
Forcing a HALO 5 regeneration
The installation manual’s start-up steps say to force a regeneration by pressing “the up and down arrow button at the same time until the Regeneration cycle begins,” and that “water will run 10 minutes” (installation manual, PDF page 5). HALO calls for forced regenerations at three moments:
- After installation: two forced regenerations, then run every fixture for 2 minutes. The quick-reference guide warns that if this is skipped the customer “will likely complain about water quality and gray water.”
- After a vacation bypass: the vacation guide says to return the system to service and force four regenerations in a row, then run each fixture (HALO vacation guide).
- When water is still cloudy: repeat the two forced regenerations and fixture flush.
HALO 5 vacation routine
The vacation guide says to put the system in bypass when leaving, by rotating the two red bypass handles 90 degrees clockwise, then run hot and cold water for a couple of minutes so “unfiltered (chlorinated) water” reaches every fixture. On return, turn the handles back counterclockwise and force four regenerations. If you also shut off the main, leave the HALO in bypass.
CK10: a full salt regeneration
The CK10 is HALO’s ion-exchange softener. Its manual describes a down-flow softener regeneration in which “two backwashes always occur” and lists the steps and their purpose (CK10 manual, PDF page 5):
- Brine fill. The brine tank is filled to dissolve salt for the next regeneration.
- Backwash. Flow through the resin bed is reversed, “expanding and agitating the resin bed.”
- Brine in. Brine is drawn through the resin in a downward flow, removing calcium and magnesium, and flushed to drain.
- Second backwash.
- Rinse.
With the prefill option, the manual says “the prefill starts two hours before the regeneration time set,” and that “treated (softened) water is still available” during those two hours. Its example: with regeneration at 2:00 a.m., fill happens at 12:00 a.m. and backwash starts at 2:00 a.m.
What triggers a CK10 regeneration
The CK10 valve can regenerate “on demand (consumption of a predetermined amount of water) and/or as a time clock (passage of a particular number of days).” The installer settings control which (CK10 manual, PDF page 14):
- Hardness is entered in grains per gallon, default 20, range 1 to 150. The manual notes the setting “can be increased if soluble iron needs to be reduced.”
- Day Override sets the maximum days between regenerations (1 to 28) when the valve is metered, or the fixed interval when gallon capacity is off. Set to “oFF,” regeneration depends only on gallons used.
- Regeneration time defaults to 2:00 a.m.
Our HALO CK10 settings guide walks through these screens.
Salt per regeneration
The CK10 manual’s exchange capacity data lists three salt doses per cubic foot of resin (CK10 manual, PDF page 5):
| Salt per cu ft | Approximate capacity per cu ft |
|---|---|
| 6 lb | 20,000 grains |
| 8 lb | 25,000 grains |
| 15 lb | 30,000 grains |
Our arithmetic: the H-CK10-150 has 1.5 cubic feet of resin according to HALO’s CK10 spec sheet, so it would use about 9, 12 or 22.5 lb of salt per regeneration at those three doses, for about 30,000, 37,500 or 45,000 grains. The manual does not say which dose HALO ships as standard. The manual also recommends “a good grade of solar or pellet salt” and gives the conversion from ppm to grains: divide by 17.1.
Starting a manual CK10 regeneration
The manual describes two options (CK10 manual, PDF page 15):
- Tonight: press and release REGEN. “REGEN TODAY” flashes, and the system regenerates at the set time. Pressing REGEN again cancels it.
- Now: press and hold REGEN for three seconds. “The system will begin to regenerate immediately. The request cannot be cancelled.”
The manual adds a warning for softeners: “if brine tank does not contain salt, fill with salt and wait at least two hours before regenerating.” It suggests a manual regeneration before “a period of heavy water usage because of guests or a heavy laundry day.”
During any regeneration, the display shows the current step and the time left. The manual warns that “if there is a demand for water when the system is regenerating, untreated water will be used.”
Hybrid: carbon and softening in one tank
HALO’s products page describes the Hybrid as filtration and softening in a single tank with a mid-plate design, where the carbon “also protects the resin from chlorinated water.” Its manual uses the same valve sections as the CK10, including the REGEN button behavior and the “ERROR” message (Hybrid manual, PDF page 15). Treat the CK10 instructions above as the starting point, and confirm the Hybrid’s salt and hardness settings with your installer.
Checking that regeneration is happening
- HALO 5: toggle the main screen with the arrow buttons to see days until next regeneration, and confirm it matches the interval you set.
- CK10 and Hybrid: the Diagnostics menu shows days and gallons since the last regeneration; Valve History shows total regenerations since start-up (CK10 manual, PDF page 16).
- Salt level: on a softener, a salt level that never drops suggests regeneration is not drawing brine.
If the display shows a code instead, see our HALO error codes guide. For the cost side of salt and water, see the HALO cost guide.
Frequently asked questions
How often does a HALO 5 regenerate?
The installation manual says once a week for ten minutes. The quick-reference guide recommends 11 days for one person, 9 days for two to three people and 7 days for four or more, unless the homeowner asks otherwise.
Does a HALO 5 use salt to regenerate?
No. The HALO 5 is a filtration and conditioning system with no resin or brine tank. Its weekly cycle is a backwash that fluidizes and re-compacts the media bed to prevent channeling.
How do I force a regeneration on a HALO CK10?
Press and hold REGEN for three seconds to start immediately; that request cannot be cancelled. Press and release REGEN to schedule it for the set regeneration time, shown as “REGEN TODAY.” Add salt and wait two hours first if the brine tank was empty.
Why does my HALO softener make noise at midnight?
With the prefill option, the CK10 manual says brine fill starts two hours before the set regeneration time. With the default 2:00 a.m. regeneration, the fill runs at 12:00 a.m. and the backwash at 2:00 a.m.