Getting your salt system started

Starting Your Salt System: A New Pool Owner's Guide

So you got a new pool with a salt system, and now you're wondering when to add salt, how much, and what all those numbers mean. Good news, it's simpler than it looks.

First thing: don't add salt yet

If your pool was just filled, hold off. You don't start the salt system or add salt until about a month after the pool is filled. The plaster or finish needs time to cure, and starting too early can cause problems. So for that first month, it'll be treated like a regular chlorine pool. That's normal.

How salt systems actually work (the 30-second version)

Here's the part nobody explains: your salt system doesn't replace chlorine. It makes chlorine.

You add salt to the water. The water flows through a part called the salt cell (it's in your equipment plumbing). The cell runs electricity through the salt water, and that process turns the salt into chlorine. That chlorine sanitizes your pool, and then it converts right back into salt and gets used again.

It's a loop. The same salt keeps making chlorine over and over. That's why once the salt is in the water, it doesn't leave unless the water leaves. No evaporation loss, no "using it up." If your salt level drops, it's because water left, a big rain overflow, a backwash, splash-out, or a leak. Otherwise it just stays put and keeps working.

That's the whole magic. You're basically running a tiny chlorine factory off a bag of salt.

How much salt do I buy?

Every pool is a different size, so there's no single number. For a typical pool, plan on somewhere around 6 to 10 bags when starting from zero. A smaller pool needs fewer, a big one needs more.

But here's the most important rule of the whole post:

Add LESS than you think you need, then test and add more.

I can't stress this enough. It's easy to add more salt. It is a huge pain to remove it, the only way to lower salt is to drain water out and refill. So start low, let it dissolve and circulate for several hours, test, and add more if needed. Ease up on your target salt level. Don't dump it all in at once.

What number am I aiming for?

For most salt systems, you want your salt level around 3,000–3,400 ppm (parts per million).

For a Jandy salt system, the cell works anywhere from 2,400 to 4,000 ppm, but right around 3,000 ppm is the sweet spot.

How do I read my salt level?

Depends on your equipment:

• If your control panel has a "salt" button (sometimes a little salt shaker icon) press it and it'll show you the exact number. Some panels show it as a decimal, like 3.4, which just means 3,400 ppm. Easy.

• If your panel only says "Low Salt" or "Add Salt" with no exact number, you'll need salt test strips to check the actual level. Grab a bottle of these when you buy your salt — they're cheap and you'll use them regularly.

Either way, test, compare to your 3,000 ppm target, and add salt slowly until you're in range.

Setting your cell's output percentage

Once your salt is in range, your system will ask you to set an output percentage which is basically how hard the cell works to produce chlorine, from 0 to 100%.

There's no perfect universal number here because it depends on your pool's demand, how much sun it gets, how much it's used, how hot it is, how long you run your pump. But a solid starting point:

Start somewhere in the middle, around 50% and adjust from there.

Then test your chlorine over the next few days:

• Chlorine too low? Bump the percentage up.

• Chlorine too high? Dial it down.

In our hot, sunny summers you'll likely run it higher. In cooler months you'll run it lower. You'll find your pool's number within a week or two of small adjustments.

Do I still have to test and balance chemicals?

Yes, the salt system handles chlorine, but it doesn't do everything. You still need to test and balance your pH, alkalinity, and the rest, just like any pool. The salt cell is only in charge of sanitizing.

The good news: once your cell is dialed in, it should produce enough chlorine all week on its own. You won't be adding chlorine by hand anymore, that's the whole point and the best part. The exception is heavy rain. A big storm dilutes everything and throws things off, so afterward you may need to give it a hand for a day or two.

Ongoing salt - what to expect

Once you're set up, salt is low-maintenance. In normal conditions you shouldn't need to add more than about one bag a month, if that. Remember, the salt gets recycled, you're only topping off what's lost to splash-out, backwashing, or rain overflow. If you find yourself adding way more than that, something's leaking and it's worth a look.

The one mistake to avoid

If you take nothing else from this: it's better to be a little low on salt than a little high. Low is a five-minute fix, add a bag or 2. High means draining water, and nobody wants to do that. Go slow, test often.

That's it. Once it's running, a salt pool is honestly one of the easiest, most hands-off ways to keep a pool clean. The setup just takes a little patience up front.