Are Generic Salt Cells Good?

Some aftermarket cells work fine for years and some do not, and none of our approved sources publishes head to head testing of aftermarket cells against original equipment cells. So this page does not rank products and will not pretend it can. What it can do is tell you what actually determines whether any cell works in your system, which is the cell type setting in your controller, the condition of the plate coating, and what the warranty is worth when you try to use it. The only honest comparison is cost per year over a 3 to 7 year window, and that number does not exist until the cell is dead.

What our sources cover, and what they do not

Our sources cover what cells do, how they fail, how long they last and what they cost to replace. They do not publish bench tests of one manufacturer’s plates against another’s, they do not publish coating thickness, and they do not publish warranty claim rates. We are not printing numbers for those because none of our sources has them, and this is exactly the kind of question where invented specificity does the most damage. How we handle that is set out on how we test.

That leaves you with questions rather than a verdict. The questions below are the ones that separate a cell that lasts from one that does not, and most of them are answerable before you buy.

The controller has to know what cell it is talking to

This is the failure mode that gets blamed on the water, and it is the strongest argument for care when you buy outside the original equipment.

A salt chlorine generator has no salt sensor. It measures the conductivity of the water, temperature compensated, and infers a salinity number from it. That inference only works if the controller knows the electrical characteristics of the cell in the line, which is why these systems have a cell type or model setting in the menu. Put a cell on a controller that is set for a different cell, and the panel will report a salt number that is simply wrong while the water is fine. It may read low and send you to the store for four bags of salt. It may read normal on a pool that is genuinely low. This is one reason to pick the cell and controller as a pair, as the guide to choosing a salt system explains.

The panel warning that follows is not diagnostic either. A LOW SALT warning is frequently not low salt, and scale, cold water, low flow and cell age all produce it. Add a mismatched cell to that list.

Practical version. Before you order anything, find the cell type setting on your controller and find out which settings it offers. Ask the seller which of those settings their cell is built to answer to. If nobody can answer that, you are buying a cell that may work as an electrode while lying to you as a sensor. After the swap, check the panel reading against an independent test rather than believing it, which is the job on test salt cell, and get the menu set correctly as covered on calibrating salt cell. What the number is supposed to be in the first place is on salt levels.

The coating is the product

The plates in a cell are titanium with a coating on them, and the coating is the part that produces chlorine. It is also the part that wears. A pool builder’s service data is direct about what destroys it early: cleaning the cell too frequently, or using an acid solution that is too concentrated, prematurely erodes the coating off the titanium grids.

Two things follow. First, you cannot judge coating quality from a photo, a price or a spec sheet, because none of our sources publishes a coating specification for anyone’s cell. Second, and more usefully, coating is the variable you personally control after purchase. Manufacturer instructions run as strong as 4:1 water to acid, one gallon of water to one quart of muriatic acid, while other guidance uses one gallon of water to one cup of muriatic acid, four times weaker. Treat the manufacturer strength as a ceiling and start weaker. The method is on to clean salt cell.

A cheaper cell cleaned gently can easily outlive an expensive cell that gets a full strength acid bath every month. That is not a defense of cheap cells. It means the buyer is a bigger variable than the badge.

The warranty question is a cost per year question

A warranty is not a feeling of safety, it is a division problem. A cell that costs less up front but carries a shorter term, or a term that is hard to claim on, can end up costing more per year than the expensive one. None of our sources publishes warranty terms for any cell, so we are not quoting any. Ask these before you pay:

• How many years, and is it prorated after a certain point?
• Who actually honors it, the seller or the manufacturer, and where does the cell have to be shipped?
• Does a claim require proof of water chemistry, cleaning records or professional installation?
• Is a replacement cell under warranty a new cell or a refurbished one?

Then run the arithmetic from how much does a salt cell cost. A $700 cell that dies in 3 years is $233 a year. A $1,100 cell that runs 7 years is $157 a year. The cheaper cell was the more expensive purchase, and nothing on the box told you that in advance.

The real alternative to a cheap cell is not another cheap cell

There is a third option people skip. Replacement cells run $700 to $1,100, control boards run $500 to $900 with the same 3 to 7 year lifespan, and when the cell needs replacing many owners find it makes sense to replace the whole chlorine generator because a new unit is “only a couple hundred dollars more”.

So when a generic cell saves you a few hundred dollars, compare that saving against a complete new unit with a fresh board, a fresh warranty on both halves and no cell type mismatch to worry about. If your controller is already several seasons old, the gap between a discount cell and a whole new system is often smaller than it looks. That decision is laid out on salt cell replacement, and if you are still working out what the cell does in the system at all, start with salt cell for pool.

The honest test

A well maintained cell lasts 3 to 7 years. That is the window every cell purchase lands somewhere inside, and the difference between the two ends of it is worth more money than the difference between any two cells on the shelf.

Nobody, including us, can tell you in advance which end of that window a given cell will land on. What you can do is remove the things that push it toward the short end: get the controller setting right, clean rarely and weakly, keep the water balanced, and stop replacing cells that were only scaled. The signs that separate a genuinely worn cell from a dirty one are on how long does a salt cell last. Judge the purchase after the fact, on dollars per year, and be suspicious of anyone who claims to know that number on the day of sale.

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