Direct answer: HALO’s December 2024 CK10 sheet lists three softeners that share an 18 x 36-inch brine tank and 1-inch plastic elbow connections. The H-CK10-150 has a 10 x 54-inch tank, 1.5 resin and a 14 gpm peak flow. The H-CK10-200 has a 12 x 52-inch tank, 2 resin and 16 gpm. The H-CK10-250 has a 13 x 54-inch tank, 2.5 resin and 18 gpm. HALO does not publish a grain capacity for any of the three. Using the CK10 manual’s exchange data of about 20,000–25,000 grains per cubic foot, our estimate is roughly 30,000–37,500 grains for the 150, 40,000–50,000 for the 200 and 50,000–62,500 for the 250. Choose by hardness, daily water use and peak flow, and get the programmed capacity and salt dose in writing.
Publisher boundary: Water System Guide is an independent research publisher, not HALO or a HALO dealer. Model specifications come from HALO’s CK10 spec sheet (December 5, 2024). The capacity ranges are our arithmetic from the exchange data in the CK10 operating manual HALO posts, not HALO ratings. All documents were reviewed October 8, 2026. HALO publishes no prices on these documents, and this page gives none.
HALO CK10 specifications by model
From the CK10 spec sheet:
| Model | Mineral tank | Resin | Brine tank | Peak flow |
|---|---|---|---|---|
| H-CK10-150 | 10” x 54” | 1.5 | 18” x 36” | 14 gpm |
| H-CK10-200 | 12” x 52” | 2 | 18” x 36” | 16 gpm |
| H-CK10-250 | 13” x 54” | 2.5 | 18” x 36” | 18 gpm |
The sheet heads the resin column “Resin SQ FT.” Softener resin is measured by volume, and the manual’s exchange data is per cubic foot, so we read these as cubic feet. Confirm the resin volume with the installer.
All three share the same sheet-level conditions. CK10 is for cold water only, must not exceed 80 psi, is intended for residential use only, must not freeze, and needs a temperature range of 40–100°F. HALO says the series includes a high-flow bypass and 1-inch plastic elbow connectors, and describes metered regeneration.
How many grains does each CK10 remove?
HALO’s sheet does not say. The CK10 operating manual, page 5, gives general exchange capacity data for the valve’s softener set-up: about 20,000 grains per cubic foot alongside “6 lbs. salt,” and about 25,000 grains per cubic foot alongside “8 lbs.” A third row (30,000 grains) is printed with a salt figure we cannot read unambiguously, so we do not use it.
Multiplying those figures by each model’s resin volume gives these estimates:
| Model | Resin | ~20,000 gr/cu ft | ~25,000 gr/cu ft |
|---|---|---|---|
| H-CK10-150 | 1.5 cu ft | ~30,000 grains | ~37,500 grains |
| H-CK10-200 | 2 cu ft | ~40,000 grains | ~50,000 grains |
| H-CK10-250 | 2.5 cu ft | ~50,000 grains | ~62,500 grains |
Our arithmetic, not a HALO rating.
The manual does not say whether the 6- and 8-pound salt figures are per cubic foot or per regeneration. What actually governs your softener is the ion-exchange capacity and pounds of salt per regeneration that the installer enters in the valve’s OEM set-up menu (page 12). The manual says that capacity should be “based on test data.” Ask for both numbers in writing. Our CK10 settings guide explains where they live.
Days between regenerations: a worked illustration
Illustration only: Suppose your water is 15 grains per gallon and the house uses 250 gallons a day. That is 3,750 grains a day. At the lower estimate (20,000 grains per cubic foot):
| Model | Estimated capacity | Days between regenerations |
|---|---|---|
| H-CK10-150 | ~30,000 grains | ~8 days |
| H-CK10-200 | ~40,000 grains | ~10.7 days |
| H-CK10-250 | ~50,000 grains | ~13.3 days |
The valve also holds back a reserve, which it estimates automatically when gallons capacity is set to AUTO (page 13). The real interval is therefore shorter. The day override caps the interval at 1–28 days. For the full method, use our water softener sizing guide or the softener sizing calculator.
Peak flow: 14, 16 or 18 gpm
Flow is the other half of sizing. HALO lists peak flow rising with tank size: 14, 16 and 18 gpm. The manual’s control valve itself is rated for 27 gpm service flow at a 15 psi drop (page 4). That is a valve rating, not the softener’s, and we do not substitute it for HALO’s model figures.
If your household often runs two showers, a washer and a sink at the same time, ask the installer what peak demand they calculated. The valve’s diagnostic screens record the maximum flow rate in the last seven days (page 16), which is a useful check on an existing installation.
Space and installation
The 150 and 250 tanks are both 54 inches tall, and the 200 is 52 inches. Diameter grows from 10 to 13 inches. All three use the same 18 x 36-inch brine tank, so the floor space differs mainly by mineral tank diameter. The manual calls for a drain line of at least ½ inch, or ¾ inch where the backwash rate exceeds 7 gpm or the line runs more than 20 feet (page 3). It lists a regenerant refill rate of 0.5 gpm. HALO’s sheet adds the 80 psi maximum, and the warranty requires 40–80 psi.
Pretreatment changes the warranty more than size does
HALO’s CK10 limited warranty (July 2025) is the same for all three sizes:
| Item | Without HALO pretreatment | With HALO 5, H2 Zero or Mini pretreatment |
|---|---|---|
| Valve and electronics | 5 years from date of manufacture | 10 years |
| Resin | 1 year | 10 years |
| Mineral tank | One replacement within 10 years of purchase | Same |
The warranty also says media and internal control valve parts are not covered for systems on feed water at or above 1 ppm chlorine. It requires 33–120°F and 40–80 psi, excludes labor, and does not transfer to a later owner. If a quote pairs a CK10 with HALO 5, see HALO 5 vs CK10 vs Hybrid for what each tank does, and our HALO warranty guide for the full terms.
Questions to get answered in writing
- Which model is proposed, and what hardness, daily use and peak flow was it sized for?
- What grain capacity and pounds of salt per regeneration will be programmed?
- What resin volume is in the tank, in cubic feet?
- Is pretreatment included? Which CK10 warranty terms apply as a result?
- Is my feed water chlorinated at or above 1 ppm?
- What does the installed price include: bypass, drain, permits and start-up?
Frequently asked questions
What is the difference between the HALO CK10-150 and CK10-200?
The CK10-150 has a 10 x 54-inch tank, 1.5 cubic feet of resin and a 14 gpm peak flow. The CK10-200 has a 12 x 52-inch tank, 2 cubic feet and 16 gpm. Both use an 18 x 36-inch brine tank.
What is the grain capacity of a HALO CK10-250?
HALO does not publish one. Using the CK10 manual’s exchange data of about 20,000 to 25,000 grains per cubic foot, 2.5 cubic feet of resin works out to roughly 50,000 to 62,500 grains. That is our estimate, not a HALO rating. Ask the installer for the programmed capacity.
Do all CK10 models use the same brine tank?
Yes. HALO’s December 2024 spec sheet lists an 18 x 36-inch brine tank for the CK10-150, CK10-200 and CK10-250.
Does the CK10 resin warranty depend on the model size?
No. HALO’s July 2025 CK10 warranty gives 1 year on resin for every size. It extends resin and valve coverage to 10 years when the CK10 is pretreated by a HALO 5, H2 Zero or Mini system.
Sources and review scope
- HALO CK10 spec sheet, December 5, 2024; retrieved October 8, 2026.
- CK10 operating manual and programming guide, posted by HALO (file uploaded November 2024); retrieved October 8, 2026. Pages 3–5, 12–13 and 16.
- HALO CK10 softening system limited warranty, July 13, 2025; retrieved October 8, 2026.
- Capacity estimates and days-between-regeneration figures are our arithmetic from the manual’s general exchange data and HALO’s resin volumes. They are not manufacturer ratings.