ACE Salt System Parts Explained: 76078, 76067, 76298 & More

Nine times out of ten, the ACE part you’ll actually order is the 76078 salt cell — the system’s only scheduled wear part, good for 2–3 years of typical use, and a DIY-friendly swap. The 76298 retrofit kit covers 2004–2008 Hot Spring spas, while the 76067 complete assembly, 77401/76079 controllers, 74880 power supply, and consumables round out the rest of the parts family.

Walk up to a spa parts counter and ask for “an ACE part” and you’ll get a question back: which one? The ACE® Salt Water System spans a dozen part numbers — cell, controllers, power supply, cleaner, salt, test strips — and ordering the wrong one costs you a week of shipping and another weekend of waiting. Consider this your parts-desk cheat sheet for the whole family: what each number is, what it does, when it needs replacing, and whether the job is DIY or dealer territory.

The ACE parts family at a glance

Notice the pattern: the consumables and the cell are user-serviceable; everything that involves the system’s electronics leans dealer. Now let’s go part by part.

76078: the salt cell — the part you’ll actually order

The 76078 is the heart of the system: a cartridge containing a diamond-coated electrode. During electrolysis, that electrode converts dissolved salt into chlorine, which sanitizes the water and then reverts back to salt — a cycle that’s largely self-sustaining, which is why ACE owners add salt only occasionally and chlorine hardly ever.

Hot Spring’s official maintenance guidance says the cell typically lasts 2–3 years, with some dealers quoting 1–2 years under heavy use. The factory comparison is “like tires on a car” — more hours of operation means faster wear. Because it’s a wear item by design, the cell is built to be user-replaceable, and it fits every ACE-equipped model; our ACE cell compatibility chart lists them all.

On price: dealer prices for the OEM 76078 cell sit firmly in the high triple digits as of late 2026, while aftermarket compatible cells are widely available well below that. If you’re weighing the two paths, we cover the honest pros and cons in our analysis of aftermarket ACE cells.

When the cell does go, our ACE-compatible replacement cell for the 76078 is a direct swap across the whole model range. Check current pricing and availability on Amazon.

76067: the complete system assembly

The 76067 is the whole ACE system as an assembly — the parts that make a spa “an ACE spa” rather than just the wear item inside it. You’d only encounter this number in two situations: specifying a full system for a spa that’s getting one, or replacing an ACE installation wholesale after, say, equipment damage.

In practice, almost nobody orders a 76067 because their cell wore out. If a technician has told you that you need the complete system rather than a cell, get a second opinion and a written diagnosis — the price gap between the two jobs is significant, and a complete-system recommendation for what is actually a spent cell is the single most expensive mix-up in ACE ownership.

76298: the retrofit kit for 2004–2008 spas

Before the 2009 model year, Hot Spring spas didn’t come from the factory with ACE — but they could get it. The 76298 retrofit kit adds the system to 2004–2008 models, and once installed, it uses the same 76078 cell as the factory version.

The takeaway for owners of older tubs: if your 2004–2008 spa already has the retrofit system and the cell has died, you’re shopping for a 76078 — not another retrofit kit. The kit is a one-time installation, not a recurring purchase.

77401 and 76079: the controllers

The controller is the brain of the ACE system — the piece that runs the electrolysis, tracks the maintenance timers, and talks to your spa’s control panel. The 77401 is the Ace 15-C version; the 76079 covers alternate system versions. Which one applies to your spa depends on the system generation, which is why these are dealer-verified parts.

You should only suspect a controller when the obvious fixes have failed: the system throws faults that persist after the cell has been cleaned and after a known-good cell has been swapped in. That diagnostic sequence — cell first, controller last — is worth following in order, because controllers cost real money and are rarely the culprit. Our ACE troubleshooting guide walks through the full decision tree.

74880: the power supply

The 74880 is the power supply that feeds the system. The replacement trigger is blunt: nothing on the ACE side of your spa works at all — no messages, no output readings, no signs of life. Before ordering one, rule out the cheap stuff first: tripped breaker, GFCI, and the spa’s main power. Our guide to salt systems that won’t turn on covers that checklist, and it applies to ACE just as it does to universal systems.

77044 and 77139: the cleaning kit

Hot Spring’s official maintenance schedule calls for cleaning the ACE cell every 90 days, because calcium scale builds on the electrode and quietly chokes chlorine production. The 77044 is the cleaning bottle the cell soaks in, and 77139 is the cell cleaner itself (sold 12 to a case). The pairing is simple: bottle holds the cell, cleaner dissolves the scale.

This is pure DIY — power off, pull the cell, soak, rinse, reinstall. The full ritual, including what to do when cleaning doesn’t restore output, is in our ACE cell cleaning guide; the technique also matches our general walkthrough on cleaning a scaled salt cell.

80000, 76771, and 76235: the consumables

80000 is the official spa salt, packaged by Watkins for the ACE system’s 1,750 ppm target salinity. When the system’s built-in sensor reports that salt is low, this is the matched product — though how much to add is a calculation, not a guess, and our ACE salt level guide covers the method.

76771 and 76235 are test strips — the weekly consumable in Hot Spring’s recommended rhythm: a test strip check every week, and a fuller test-and-balance routine every 30 days. You’ll know it’s time to reorder when the canister runs empty, which is the least mysterious replacement trigger in the entire parts family.

Which part do most owners actually need?

Nine times out of ten, the answer is the 76078 cell. The controllers, power supply, and complete assembly are durable, stationary electronics that usually outlive several cells; the cleaning bottle is a one-time buy; salt and strips are groceries. The cell is the one part guaranteed to wear out on schedule — and the one you can replace yourself in an afternoon.

If you’ve confirmed that’s the part you’re after, our ACE-compatible replacement cell covers the full ACE-equipped range. Check current pricing and availability on Amazon. For a broader look at when replacement makes sense and what the alternatives are, the ACE replacement guide is our hub on the topic.

FAQ: ACE parts

Which ACE part am I most likely to replace?

The 76078 cell. Hot Spring’s official guidance puts cell life at 2–3 years of typical use, making it the system’s only scheduled wear part. Everything else — controllers, power supply, housing — tends to last the life of the spa.

Can I replace the 76078 cell myself?

Yes. The cell is designed as a user-replaceable cartridge, and the swap doesn’t require special tools. Confirm your model against our compatibility chart first, and if your spa is under warranty, consider having a dealer handle it so there’s no question later.

How do I know I need a controller instead of a cell?

Suspect the controller (77401 or 76079) only when system faults persist after the cell has been cleaned and after swapping in a cell that’s known to be good. That combination rules out the wear part and points upstream. The step-by-step logic is in our ACE troubleshooting guide.

Do I have to use the official 80000 salt?

The 80000 product is the salt Watkins packages for the ACE system, formulated around its 1,750 ppm target. Whatever salt you add, the goal is the same: reach and hold that target, which the system’s built-in sensor verifies on its own. How much to add — and how to read the sensor’s feedback — is covered in our ACE salt level guide.

What’s the difference between 77401 and 76079?

They’re both ACE controllers — the 77401 is the Ace 15-C version, and the 76079 covers alternate system generations. Which one fits is determined by your spa’s system version, so this is a part to verify with a dealer using your serial number rather than to guess at.