Hot Tub Maintenance Guide 2026: The 10-Minute Weekly Routine

Quick Answer: Hot tub maintenance comes down to four clocks: every soak — test the water with a strip and top up sanitizer (chlorine 3–4 ppm or bromine 4–6 ppm); every week — shock the water and hose-rinse the filter cartridge; every month — replace an inflatable’s filter cartridge (or spray-clean a hard-shell one) and rebalance alkalinity; every 1–3 months — drain, flush the plumbing, wipe down the liner, and refill. Follow that schedule and an inflatable or plug-and-play spa stays clear and safe on about 10 minutes of work a week.

Last updated: October 30, 2026 — re-checked Intex’s filter guidance on its own S1 cartridge page (clean weekly, replace once a month or sooner — the daily-rinse and few-days filter-life figures we carried before could not be verified and are removed), split the monthly filter task into inflatable vs. hard-shell, and added a dated filter-care price check. Previously, August 21, 2026.

A hot tub doesn’t fail dramatically — it drifts. Water goes from crystal to cloudy, the filter quietly clogs, the heater works harder, and suddenly the tub you loved is a chore. The fix is a boring, repeatable schedule. Here’s the full routine for inflatable and plug-and-play spas, task by task, with the handful of products that make it painless.

Hot tub maintenance by the numbers

• 3 ppm free chlorine (or 4 ppm bromine) and pH 7.2–7.8 is the range the U.S. Centers for Disease Control and Prevention specifies for hot tub water to reliably kill the Pseudomonas aeruginosa behind hot-tub rash — the one number worth testing before every soak.
• Gallons ÷ 3 ÷ daily bathers = days between drains is the spa industry’s standard drain-interval formula. For a 250-gallon inflatable used by two people daily that works out to roughly 40 days, not the “once a season” many owners assume.
• Clean weekly, replace once a month or sooner is what Intex’s own store page says for the Type S1 cartridge in PureSpa tubs (some Intex retail listings, such as Lowe’s, say every two weeks). A 6-pack is $29.99 on Intex’s store, or $5.00 a cartridge (October 30, 2026), so inflatable filters are a consumable, not something to nurse along.
• About 10 minutes a week is the real time cost of the weekly routine below: shock, rinse the filter, wipe the waterline. Everything else is monthly or quarterly.
• 1,500 ppm above your fill water’s baseline is the total dissolved solids (TDS) threshold the Pool & Hot Tub Alliance recommends as the drain-and-refill trigger — a daily-use tub can hit it in as little as 3–4 months, which is why the gallons-÷-3-÷-bathers formula above and a TDS check should agree before you decide the water’s still good.

The maintenance schedule at a glance

According to the CDC, hot-tub water needs free chlorine of at least 3 ppm (or bromine at least 4 ppm) and a pH of 7.2–7.8 to reliably kill the germs behind hot-tub rash — which is why the every-soak test strip, the smallest task on this list, is also the most important one.

Every soak: test, dose, cover

Before (or right after) each soak, dip a test strip and read sanitizer, pH, and alkalinity. If sanitizer is low, add a measured dose — a floater with the flow dialed in is the easiest way to keep that dose steady between tests instead of hand-dosing every time; if pH has drifted out of 7.2–7.8, nudge it back. Which products do what — and which to buy — is covered in our hot tub chemicals guide; this guide is about when, that one is about what. The routine only works if the strip itself is good: dip elbow-deep away from the jets, and replace the bottle at its printed expiration date — our best hot tub test strips guide covers which strip suits chlorine versus bromine and how accurate strips really are.

Skim the surface for leaves, bugs, and hair before you dip the strip — a compact hot tub skimmer net takes about 30 seconds and keeps that organic debris out of the filter instead of just circulating it. Then put the cover back on, every time. Per the U.S. Department of Energy, most of a spa’s standby heat escapes from the water surface, so a secured insulated cover is the single biggest lever on your monthly running cost — it keeps heat in, debris out, and your sanitizer from burning off in sunlight.

Weekly: shock and rinse the filter

Once a week, add a dose of shock (non-chlorine MPS lets you soak again in about 15 minutes) to burn off the sweat, oils, and lotions your sanitizer leaves behind. Do it with the pump running and the cover off for 20 minutes — see our best hot tub shock guide for which type to buy and how much to dose.

While the shock circulates, pull the filter cartridge and blast it with a garden hose, fanning the pleats apart. Intex’s own S1 cartridge page calls for cleaning a PureSpa cartridge every week and replacing it once a month or sooner (every two weeks if the tub sees daily use) — a clogged filter is the number-one reason inflatable-tub water turns cloudy and the pump strains. A badly clogged filter can also cut flow enough to trip the safety switch that shuts the heater off entirely; if your tub ever stops heating, rule this out before assuming the heater itself has failed — see our hot tub not heating guide for the full troubleshooting order. Wipe the waterline with a soft cloth or spa-safe scum sponge while you’re at it — see our hot tub scum line guide if that ring keeps coming back no matter how well the water tests — and run a handheld vacuum over the floor — that’s the debris your filter never touched in the first place, since it sank before the pump could pull it.

Monthly: deep-clean the filter, check the slow chemistry

A hose rinse clears debris but not the body oils soaked into the pleats, and what you do about that depends on the cartridge. Inflatable tubs: rotate in a fresh spare — at $5.00 for an Intex S1, a new cartridge costs less than half of one overnight soak. Hard-shell spas: Leisure Time’s recommended cadence is a monthly spray clean (its Instant Cartridge Clean needs about a 5-minute dwell, roughly $1.17 a use) and a full overnight soak every 3–4 months at drain-and-refill (Filter Clean, 16 oz in 4 gallons, $12.00 a soak). Our best hot tub filter cleaner guide prices every option per clean and shows the cartridge price, about $47 on the life figures in Leisure Time Inc.’s Filter Clean listing, below which rinsing and replacing beats a chemical routine. If you’re not sure which cartridge your spa takes, our best hot tub filters guide decodes the part numbers and cross-references for Intex, SaluSpa, and hard-shell spas. Check total alkalinity (80–120 ppm) and calcium hardness on your strip too; they drift slowly, but when alkalinity is off, pH refuses to hold steady. While you’re topping off the water level, note how much you’re actually adding — losing meaningfully more than the normal evaporation range each week is the first sign of a leak, not just summer heat.

Filter-care price check (October 30, 2026)

Buy cartridges by the 6-pack: the same S1 cartridge costs a third less than in the 2-pack.

Every 1–3 months: drain, flush, refill

No amount of chemistry fixes old water. Dissolved solids build up with every dose until the water resists balancing — the cue to start fresh.

When exactly? Use the spa industry’s standard drain-interval formula: gallons ÷ 3 ÷ daily bathers = days between drains. A 250-gallon inflatable tub with two daily soakers works out to roughly 40 days; a lightly used plug-and-play spa can stretch to 3–4 months. If you own a TDS meter or strip, treat it as a second check: once total dissolved solids climb 1,500 ppm above your fill water’s own baseline reading, the Pool & Hot Tub Alliance calls that the drain point regardless of what the day-count formula says — TDS buildup is what makes sanitizer stop working even when the dosing looks right.

The drain-day routine:

1. Flush the plumbing first. Add a line-flush cleaner and run the jets for 15–30 minutes — it purges the biofilm hiding in the pipes that would instantly recontaminate fresh water.
2. Drain using the tub’s valve or a submersible pump (grey water only, once chlorine has dropped — check local rules).
3. Wipe down the liner or shell with a soft cloth and diluted spa surface cleaner. Never use household cleaners on an inflatable liner; residue foams and throws off chemistry — see our hot tub foam guide if bubbles show up between drains.
4. Refill through the filter housing if possible (fewer airlocks), then rebalance in order: alkalinity → pH → sanitizer, as covered in the chemicals guide.

Seasonal extras

• Summer: UV is hard on liners and covers — a spa cover protectant wipe-down every month or two keeps the vinyl from cracking.
• Winter: an inflatable tub in a cold climate needs freeze protection and a few extra habits — our winter inflatable hot tub guide covers which tubs handle it and how to run them. Taking a tub out of service instead? Our hot tub winterizing guide covers the full drain, line-blowing, and antifreeze process.
• Going away? Don’t shut a tub off in freezing weather; either keep it heated at a low setpoint or drain it fully. A frozen pump is a dead pump.
• Not sure what setpoint to use in the first place? Our hot tub temperature guide covers the ideal range for relaxation versus recovery, the CPSC’s 104°F safety ceiling, and how long a cold-fill actually takes to heat up.

The cost of doing it right (and wrong)

The whole routine — chemicals, replacement filters, the occasional line flush — runs $20–$50 a month on top of the $30–60 a month in electricity a typical inflatable or plug-and-play spa uses (see the full running-cost breakdown). Skipping it isn’t cheaper: a neglected filter makes the pump and heater work harder, cloudy water takes triple the chemicals to rescue, and a biofilm-fouled tub often means a full drain plus purge anyway. For the gear side of the routine — covers, steps, spare filters, ground mats — see our best hot tub accessories roundup.

The bottom line

Hot tub maintenance is four clocks: test every soak, shock and rinse weekly, deep-clean monthly, drain quarterly-ish. Ten minutes a week beats an afternoon of rescue chemistry every time. If you’re still choosing the tub itself, start with our best inflatable hot tub roundup or the best plug-and-play spas — and since every task above involves something you rebuy, it’s worth checking whether Amazon Prime is worth it for hot tub owners before you stock the shelf — and if you’re buying the tub itself, our hot tub deals guide covers when prices actually drop. If jets have started running weak despite staying current on this routine, our hot tub jets guide walks through the airlock, valve, and filter checks that usually explain it. And if the breaker starts tripping despite everything else being in order, our hot tub keeps tripping breaker guide covers the electrical side of troubleshooting. For the actual step-by-step drain-day process — valve versus submersible pump, and where the water is allowed to go — see our how to drain a hot tub guide. And if you’re still deciding which sanitizer to base this whole routine around, our bromine vs chlorine comparison breaks down the real cost and dosing-frequency tradeoff. If a fresh fill keeps turning green despite staying on schedule, our hot tub green water guide covers the copper-vs-algae diagnosis this routine alone won’t fix. And if letting sanitizer drift has already left you with itchy bumps after a soak, our hot tub rash guide covers symptoms, treatment, and how long it typically takes to clear up.