Can You Pee in a Saltwater Pool?

No. Salt does not change the answer, because a salt pool is a chlorine pool. The cell turns dissolved salt into chlorine, and that chlorine reacts with urine exactly the way it would in any other pool. The result is the red eyes and “chlorine” smell everyone blames on the pool chemicals.

The official answer

The CDC’s advice on pool eye irritation has a line that does not leave much room for interpretation: “Never pee in the water.”

Nobody is testing your pool for this. But the reason behind the rule is chemistry, not manners, and it is worth knowing because it explains a few things you have probably noticed.

Why salt does not help

The salt in a saltwater pool is not what keeps it clean. At the 3,200 ppm one manufacturer’s manual calls ideal, it is about 9% as salty as seawater, which NOAA puts at about 35 parts per thousand. The salt chlorine generator runs a current through the water to make chlorine from that salt. From then on, your pool is sanitized by chlorine, the same chemical a manually dosed pool uses.

So anything true about peeing in a chlorine pool is true about peeing in a salt pool. The water chemistry that follows is the same.

What urine does to chlorine

The CDC lists what chlorine reacts with once swimmers get in: “pee, poop, sweat, dirt, skin cells, deodorant, and makeup that wash off swimmers’ bodies”. When that happens, the CDC says, “it causes two problems”.

The first problem is that the chlorine gets tied up. Chlorine that has bonded to waste is chlorine that is no longer free to kill germs. The CDC does not put a number on how much, and we will not invent one. The direction is what matters: more waste in the water means less free chlorine left over for sanitizing.

The second problem is what that bonding produces. The CDC’s pool operations page calls the result chloramines, “a type of combined chlorine that form in water and then off gas into the air above the water.” They form when “chlorine binds to the body waste swimmers bring into pools.”

So the “too much chlorine” smell is partly the swimmers

Here is the part that surprises people. The sharp smell you associate with a heavily chlorinated pool is mostly not chlorine. The CDC says “If you smell ‘chlorine’ at the place you swim, you are probably smelling chloramines.”

Put that next to the list above and the conclusion is uncomfortable. When a pool reeks after a busy weekend and everyone’s eyes sting, a good share of that is what the swimmers brought in, pee included. We cover the smell in its own right in why a salt water pool smells like chlorine.

Why a busy day can outrun a salt cell

A salt cell makes chlorine continuously, in small amounts, over the hours the pump runs. That suits a quiet pool with steady use. It is not built to respond quickly when a crowd adds a lot of waste in one afternoon.

Most panels have a boost or super chlorinate setting, and owners often assume it handles this. In The Swim says most salt systems in that mode will only lift free chlorine up to 5 to 7 ppm, and “It also does it very slowly.” Its conclusion is that the feature “is best used for superchlorinating purposes, and not for shocking the pool.”

In The Swim’s trigger for a real shock is chloramines at “0.3 ppm or higher.” After a pool party, test free and total chlorine. If the gap is at or above that, add shock rather than waiting for the cell to catch up. Our guide to salt water pool shock walks through how.

Keeping free chlorine where it belongs for your stabilizer level also leaves more headroom for a heavy day. Trouble Free Pool puts the salt pool minimum at about CYA x 5%. At CYA 60, that is 60 x 0.05 = 3 ppm free chlorine. A pool already sitting below that line going into a party has less to spare when the swimmers arrive. Our page on optimal chlorine levels explains how that target moves with CYA.

What actually helps

Two habits cover most of it, and both come straight from the CDC.

First, the obvious one. Use the bathroom before getting in, and take kids on regular breaks.

Second, the one people skip. The CDC says “Rinsing off in the shower for just one minute can remove most of the dirt or anything else on your body.” Its pool operations guidance adds that “Even a quick rinse shower removes much of the body waste that helps form chloramines.” An outdoor shower or a hose by the gate does the job.

Less waste in the water means your cell’s chlorine goes to sanitizing instead of being tied up, and the pool smells like almost nothing. For more on running one of these pools, see our salt water pools hub and the salt cell guides.

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