Wondering what upkeep a hot tub really needs? Here are the seven tasks that keep the water clean and clear.

I'm Adam, and I've serviced pools and spas across Long Beach for about fifteen years. When someone asks me what maintenance a hot tub needs, the honest answer is seven core tasks: test and balance the water, keep the sanitizer steady, clean the filter, wipe down the shell and waterline, drain and refill every few months, care for the cover, and check the circulation. Do the small ones weekly and the bigger ones on a schedule, and your tub stays clean, clear, and ready the moment you want it. A hot tub is a small body of very warm water, so everything happens faster than it does in a pool, which means a little consistency goes a long way.

1. Test and balance the water every week

Balanced water is the foundation, and everything else fails without it. Balance means three readings held in range: pH between 7.2 and 7.8, total alkalinity between 80 and 120 parts per million, and calcium hardness between 150 and 250. When those drift, you feel it. Low pH turns the water acidic and eats at heater elements and jet seals, while high pH lets scale form and makes your sanitizer sluggish. Total alkalinity is the buffer that keeps pH from bouncing around every time you add a chemical.

The reason a spa needs testing two or three times a week, not once, is heat. Hot water constantly off-gasses carbon dioxide, and that steadily pushes pH upward on its own. Test strips are fine for a quick check, but a liquid drop kit reads truer. Adjust in small doses, wait a couple hours with the pump running, then retest before you add more.

2. Keep the sanitizer steady and shock after heavy use

Sanitizer is what actually keeps the water safe to sit in, because warm water is a comfortable home for bacteria. Your two choices are chlorine and bromine. Chlorine works fast and cheap but burns off quickly at spa temperatures. Bromine is more stable in hot water and gentler on the skin, which is why I recommend it for most tubs. Hold free chlorine at 1 to 3 parts per million, or bromine at 3 to 5.

Sanitizer alone does not clear the invisible load of sweat, oils, and lotion that four people leave behind in a soak. That is what shocking handles. Once a week, or right after a party or heavy use, add a non-chlorine oxidizer shock to burn off that organic waste and free your sanitizer back up. In a spa's small water volume, one busy evening can swing your chemistry hard, so shocking is the reset that keeps the water from going dull and cloudy.

3. Rinse the filter weekly and deep-soak it monthly

The filter is the kidney of the whole system, and a spa filter works far harder per gallon than a pool filter because the water volume is tiny and the bather load is concentrated. Pull the cartridge once a week and rinse it with a hose, spreading each pleat so the water reaches the base of the folds where the gunk hides. That five-minute rinse is the single most underrated habit in spa care.

Rinsing alone never removes the oils and fine scale that work into the pleats over time, so once a month give the cartridge an overnight soak in a proper filter cleaner solution. Let it dry, then reinstall. Plan to replace the cartridge every twelve to twenty-four months, sooner if the pleats flatten or tear. A clogged filter starves the pump, drops your circulation, and clouds the water no matter how perfect your chemistry reads.

4. Wipe the waterline and shell surfaces

Every soak leaves a faint ring at the waterline, a mix of body oils, sunscreen, and lotion that the filter cannot catch because it floats. Left alone, that ring hardens into a scum line and stains the shell. A weekly wipe with a soft cloth or a non-abrasive spa surface cleaner keeps it from building up. Never use household cleaners, because their foaming agents wreck your water balance the second they rinse in.

Pay attention to what the shell tells you while you wipe. A smooth acrylic surface should feel slick, not chalky or rough. On older spas, especially plaster or gunite units, a gritty texture or hairline cracks are early signs the surface is wearing out, and that is where resurfacing comes in. Catching it early keeps a cosmetic fix from turning into a structural one, and it protects the equipment that sits behind that shell.

5. Drain, clean, and refill every three to four months

No amount of chemistry lasts forever in a spa, because dissolved solids keep accumulating in that small volume until your sanitizer simply cannot keep up. That is why a full drain and refill every three to four months is not optional, it is maintenance. To time it, divide your tub's gallon capacity by three, then divide again by your typical daily bather count. The result is roughly how many days the water stays genuinely fresh.

When you drain, do not just dump and refill. Wipe the empty shell, clean the exposed filter housing, and check the jets and fittings while you have clear access. Long Beach and much of the South Bay run hard water, so expect scale, and a fresh fill is your best chance to strip it before it cements onto the heater. Refill with a hose run through a pre-filter if you can, then rebalance from scratch.

6. Clean and condition the cover monthly

The cover does more quiet work than anything else on the tub. It holds in heat so your energy bill stays reasonable, and it keeps leaves, dust, and wind-blown debris out of the water, which directly reduces how hard your filter and sanitizer have to work. A neglected cover undoes maintenance you are paying for everywhere else.

Once a month, wipe both sides down and treat the top with a vinyl protectant that blocks the sun, because our long stretch of coastal sunshine cracks an untreated cover in a couple of seasons. Check the underside for mildew, and lift a corner to feel the weight. A cover that has grown heavy is waterlogged, its foam core saturated, and once that happens it insulates poorly and needs replacing. A good cover, cared for, easily lasts five to seven years.

7. Check the circulation, jets, and water level

Clean water only stays clean if it keeps moving. Your spa should run a filtration cycle every day so the whole volume passes through the filter and gets sanitizer distributed evenly. If your tub has a circulation pump, let it run continuously, and if it does not, set the timer for at least a couple of cycles a day. Stagnant water is where cloudiness and biofilm start.

Keep the water level above the highest jets and skimmer intake, because a low level lets the pump pull in air, which strains the motor and kills your jet pressure. Once a week, glance at the jets and pillows for wear, and listen for any new grinding or gurgling from the equipment pad. Those small sounds are early warnings. A quick check now is how you catch a failing pump or heater before it becomes a repair that shuts the tub down entirely.

The questions Long Beach and South Bay spa owners ask us most about keeping a hot tub clean, answered plainly.

Clean water is a rhythm, not a rescue

You should not have to babysit your hot tub or guess what it needs, because the whole system rewards a simple weekly rhythm far more than an occasional deep scramble. Test and rinse weekly, soak and condition monthly, drain and refill each season, and the water stays clear on its own. When something is beyond a homeowner fix, though, that is where we come in. Adam's Pool & Spa handles spa and hot tub service, resurfacing worn shells, and new pool and spa construction across Long Beach, Manhattan Beach, and the wider South Bay. If your water will not clear, a jet or heater is acting up, or you are weighing a bigger project, reach out through our contact page and a real technician will take a look. We are Jandy Certified and a Pentair Expert Installer.

Adam is the founder, owner, and lead technician of Adam's Pool & Spa, serving Long Beach and surrounding LA County for about fifteen years. He is Jandy Certified and a Pentair Expert Installer, and he built the business on education-first, anti-pressure service, including the "Pool School" session every new client gets.