There’s a box in your living room, and inside it is a hot tub. Congratulations — and slow down. The next 48 hours determine whether your first month of ownership is bliss or a cloudy-water chemistry war. This walkthrough is the order of operations that experienced owners wish someone had given them: site prep, inflation, the fill, the purge step almost everyone skips, balancing in the right order, and your first week, day by day.
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Set aside a weekend afternoon for the physical setup and the first fill. The chemistry part takes another day of patience while the tub heats. Rushing either part is how new owners end up draining and starting over — which, to be fair, is also a fine education, just an expensive one in water and chemicals.
Step 1: Site prep (before you open the box)
Do this first, because moving a filled inflatable is not a thing you do twice:
- Level ground. Water finds level; your tub must start there. A visibly sloped patio means one side stressed and one side shallow. Eyeball it with a long spirit level or a phone app — close enough is fine, visibly tilted is not.
- Base mat down. Lay an EVA foam base mat (interlocking tiles, check current price on Amazon) under the footprint. It insulates against cold ground, protects the liner from abrasion, and makes the whole thing feel more solid underfoot. This is the cheapest meaningful upgrade in hot tub ownership.
- GFCI outlet check. You need a grounded outdoor outlet with GFCI/RCD protection within reach of the pump’s cord — no extension leads as a permanent solution, and never a coiled extension on a winder (coiled cable under load overheats). Test the GFCI’s test button now, while it’s convenient.
- Hose reach. Confirm your garden hose reaches the spot with slack. You’ll fill, top up, and eventually drain from here.
Step 2: Unbox and inspect
Lay everything out before water touches anything: liner, pump/heater unit, cover, filter cartridges, chemical dispenser (some models include a ChemConnect-style dispenser), patch kit, manual. Check for:
- Visible liner damage — pinholes, seam splits, valve defects. Finding it now means a clean return; finding it after filling means a wet argument with customer service.
- That the filter cartridges match the pump housing (they’re model-specific).
- The patch kit is actually in the box. It’s always in the box until the day you need it.
Step 3: Inflate (warm the liner if it’s cold)
If the liner has been stored anywhere cold, bring it indoors and let it warm up first. Bestway’s manuals specify inflating above 15°C (59°F) — cold vinyl is stiff and can crack when unfolded and handled, and a cracked brand-new liner is a special kind of heartbreak. Inflate indoors if you can, then carry it out.
Inflate to firm, not drum-tight. Over-inflation stresses the seams, and the air inside will expand as the tub heats. The liner should give slightly when you press it — think firm mattress, not basketball.
Step 4: Fill — and the hot-water shortcut (with a warning)
Fill with a garden hose. Here’s the trick experienced owners use: start the fill with warm water from an indoor tap (run a hose from a utility tap or mixer) to cut the heat-up time dramatically. Every degree you add at fill time is a degree the 1.3 kW heater doesn’t have to add at 2–3°F per hour.
The warning: don’t run water hotter than about 104°F (40°C) through the hose and fittings. Very hot fill water can soften PVC fittings and stress connections — and a hose left in strong sun can deliver scalding water without you realizing. Warm, not hot. Your hand is the thermometer: comfortable bath temperature is the ceiling.
Fill to the minimum line first, check for leaks at every connection, then fill to the maximum line.
Step 5: PURGE before you balance (the step everyone skips)
This is the centerpiece of this guide, and the thing no manufacturer manual tells you: new plumbing ships dirty. The pipes, pump, and heater in your brand-new tub contain manufacturing oils, plastic residues, and the beginnings of biofilm from factory testing water that sat in the lines. If you balance your chemistry first and purge later (or never), you’re balancing water that’s about to get a contaminant dump.
The procedure, synthesized from long-running practitioner threads on TroubleFreePool:
- With the tub filled (this can be your initial fill — it’s about to be dumped), add a plumbing purge product (an Ahh-Some–style biofilm purge, check current price on Amazon) per its instructions.
- Run the jets/pump with the purge in the water for the product’s stated cycle. You will likely see brownish foam and gunk — that is exactly what you’re removing. Owners report residue on the first purge and sometimes a second one.
- Leave the filters in during the purge. They need cleaning too, and the purge cleans them.
- Drain the tub completely. Wipe down the shell while it’s empty — you’ll never have easier access.
- Refill with fresh water. Yes, really — dump the fill. This water did its job as a cleaning vessel.
Is the double water use wasteful? A bit. Is it more wasteful than fighting cloudy, foamy water for a month and draining anyway? No. Every owner who’s done the purge wishes they’d done it on day one; every owner who skipped it learns about biofilm the hard way.
Step 6: Refill, heat, and wait
Refill to the lines, start the heater immediately, and put the cover on. Now wait: roughly 18–24 hours to reach 104°F from a cold fill at the typical 2–3°F-per-hour heat rate. Start this in the evening and the tub is ready the next evening.
Don’t add your main chemical doses yet — dose into warm, circulating water, not a cold fill. (The purge product was the exception; that water’s gone.)
Step 7: Balance in order — alkalinity, then pH, then sanitizer
Order matters. Adjusting pH before alkalinity is stable is like painting a wall before the plaster dries — you’ll do it twice.
- Total alkalinity first: target 80–120 ppm. Alkalinity buffers pH; get it right and pH behaves.
- pH second: target 7.2–7.8. Use pH increaser or decreaser in small doses — overshooting and yo-yoing is the classic beginner mistake.
- Sanitizer third: chlorine 1–3 ppm or bromine 2–4 ppm. If you haven’t chosen, our chlorine vs bromine guide gives the honest trade-off (short version: bromine is the easier default for most owners).
Don’t guess the doses — plug your tub’s water volume into our chemical dosing calculator and it works out the amounts. Take your first test-strip reading 30 minutes after dosing, with the pump running. If test strips are new to you, our test strips guide walks through reading them without the second-guessing.
Step 8: Sanitizer setup for week one
Get chlorine or bromine dispensing steadily from day one: a floating dispenser with tablets, or the built-in dispenser if your model has one. A starter chemical kit (check current price on Amazon) bundles the sanitizer, pH adjusters, and shock you’ll need for the first month — it’s the one bundle actually worth buying, because you’ll use all of it.
For the full reasoning on what to buy and what to ignore, start with our beginner’s water-care guide.
Your first week, day by day
- Days 1–2: Test daily. New water drifts as everything settles — this is normal, not failure. Adjust in small doses.
- Day 3: Rinse the filter cartridge. The first few days load it with purge residue and new-tub debris. This one early rinse prevents a week of flow problems.
- Days 4–7: Keep testing daily. By the end of the week the readings should stabilize — that’s your signal that the water has “settled in.”
- After heavy first uses: shock the tub (oxidizer shock, per product instructions) after parties or heavy bather loads. Heavy use burns through sanitizer fast.
- Day 8: hand off to the maintenance schedule — the weekly/monthly rhythm that keeps this water good for months. This page got you to day 7; that page takes it from here.
Mistakes new owners make (learn from the forums, not from experience)
These are the patterns that show up again and again in owner communities — attributed, aggregated, and entirely avoidable:
- Skipping the purge. Covered above. The #1 “I wish I’d known” in every new-owner thread.
- Over-inflating. Drum-tight plus heat expansion equals stressed seams. Firm, not hard.
- The coiled extension lead. A cable wound on a reel under sustained heater load overheats. If you must use an extension temporarily, fully unwind it — and plan the proper outlet.
- Cranking to 104°F on day one with unbalanced water. Heat + unbalanced water = scale on the heater element from the start. Balance first, then heat to max.
- Shocking with the cover on. Oxidizer shock needs to off-gas. Cover on traps the gases and attacks the cover’s underside. Shock, wait the product’s stated time with the cover off, then cover.
- Buying every chemical on the shelf. You need sanitizer, pH adjusters, alkalinity adjuster, shock, and test strips. The rest is shelf decoration until you have a specific problem.
Your first-week checklist (bookmark this)
First-week checklist — no email signup, just use it:
- ☐ Site prepped: level, base mat, GFCI tested, hose reaches
- ☐ Unboxed and inspected: liner, pump, cover, filters, patch kit present
- ☐ Liner warmed and inflated (firm, not drum-tight)
- ☐ Filled, connections leak-checked
- ☐ Purge run, tub drained, wiped, refilled
- ☐ Heater on, cover on, 18–24 hr heat-up started
- ☐ Alkalinity → pH → sanitizer, in that order (dosing calculator for amounts)
- ☐ Sanitizer dispenser set up and running
- ☐ Test daily for 7 days; rinse filter on day 3
- ☐ Day 8: switch to the maintenance schedule
If anything goes sideways — a code on the display, water that won’t clear, heat that won’t rise — the troubleshooting decision tree is the next stop. And when you’re ready to understand what this tub will cost you over the years, the ownership planner maps your entire first year.
Send this page to anyone who just bought one. That’s what it’s for.
