How to Clean a Spa or Jacuzzi Tub Properly

A spa bath or jacuzzi looks clean. The basin appears white, the jets look clear, the water runs fine. But the internal plumbing of a spa — the jet pipes, the pump housing, the circulation system — is almost never cleaned, and in that warm, damp, organic-residue environment, it becomes a significant source of bacterial contamination.

When you run the spa jets, you're circulating water through this internal system and back out through the jets. If the system hasn't been cleaned, you're bathing in water that's passing through a biofilm-coated pipe network.

This post covers both the visible cleaning of the spa basin and the internal pipe cleaning that actually matters for hygiene.

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The Two Cleaning Jobs

1. External Cleaning (The Visible Basin)

The spa basin — the acrylic, fibreglass, or enamel surface you can see and touch — needs regular cleaning to remove soap scum, body oil, hard water scale, and any mould or mildew that develops around the jets or the rim.

2. Internal Pipe Cleaning (The Invisible System)

The jet pipes, the pump, the internal circulation plumbing — these accumulate:

• Biofilm: A bacterial community embedded in a sticky matrix that coats internal pipe surfaces. Biofilm is a near-universal issue in spa plumbing that hasn't been cleaned.
• Body oil and residue: Oils, skin cells and products from bathers coat internal pipe surfaces.
• Calcium and mineral deposits: Adelaide's hard water builds scale inside pipes that restricts flow and traps organic matter.

Biofilm in spa plumbing is a documented health concern. Legionella and Pseudomonas aeruginosa (which causes infections in skin, ears and eyes) can colonise spa biofilm. The warm water temperature in a spa bath is ideal for bacterial growth.

Both cleaning jobs are necessary. Most people do only the first.

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How Often to Clean

External basin: After every use (quick wipe) and weekly (thorough clean).

Internal pipes: Monthly if the spa is used regularly. Every 3 months minimum if used occasionally.

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External Basin Cleaning

What You Need

• Bathroom spray cleaner or diluted dish soap
• White vinegar for hard water deposits
• Non-scratch sponge or cloth (never abrasive pads on acrylic — they permanently scratch it)
• Old toothbrush for around jets and crevices

Method

1. After emptying the spa, rinse the basin with clean water to remove any loose residue.

2. Spray bathroom cleaner or apply a diluted dish soap solution to the basin surfaces.

3. Wipe the entire basin including the rim, the area around each jet, and any ledges. Use the toothbrush around jet fittings — soap scum and scale accumulate significantly in the crevices around each jet.

4. For hard water scale (white deposits around jets and the waterline): apply white vinegar directly to the affected areas, leave for 10 minutes, then scrub with the toothbrush. The acetic acid dissolves calcium carbonate. Rinse thoroughly.

5. For any mould developing around jets or on the basin surface: a diluted bleach solution (1:10 with water) applied with a cloth, left for 5 minutes, scrubbed and rinsed. Check your spa manufacturer's guidance on bleach — some acrylic surfaces can be sensitive to concentrated bleach.

6. Rinse the entire basin thoroughly after cleaning to remove all product residue.

7. Wipe the exterior of the spa — sides, rim, control panel — with a damp cloth.

Acrylic and Fibreglass Spa Surfaces: Important Notes

Never use:

• Abrasive pads, steel wool or rough scouring pads — permanent scratches
• Harsh chemical solvents (acetone, paint thinner) — damage the surface
• Highly concentrated bleach on coloured acrylic

Always use:

• Non-scratch sponges or cloths only
• Products specifically approved for acrylic spa surfaces when in doubt
• Rinse thoroughly after any cleaning product

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Internal Pipe Cleaning: The Critical Step

This is the part most spa owners skip, and it's the most important part from a hygiene perspective.

What You Need

• Spa pipe cleaner (specialist product — examples include Spa Marvel Cleanser, Lo-Chlor Jet Clean, or Leisure Time Jet Clean — available at pool/spa supply stores)
• Alternatively: a solution of dishwasher rinse aid or white vinegar for maintenance flushes (less effective for significant biofilm but adequate for monthly maintenance)
• Laundry powder with enzymes (for a DIY deep flush — see below)

Method 1: Specialist Spa Pipe Cleaner (For Deep Cleaning)

Use this every 3–6 months or when the spa hasn't been cleaned internally for a long time.

1. Fill the spa with warm water to the operating level (above the jets).

2. Add the spa pipe cleaner according to product instructions (typically 250–500ml per use).

3. Run all jets on maximum for 15–30 minutes. This circulates the cleaning product through the entire pipe system.

4. You will likely see dirty water, foam, and dislodged biofilm come out of the jets. This is exactly what should happen — you're flushing out what has accumulated in the pipes.

5. Drain the spa completely. You may be surprised by how dirty the water is.

6. Refill with fresh water and run the jets for 5–10 minutes to flush out any residual cleaning product.

7. Drain again.

8. The spa is now ready for normal use or for an external cleaning before refilling.

Method 2: DIY Monthly Maintenance Flush

For monthly maintenance between the deeper specialist cleans:

1. Fill the spa to operating level.
2. Add 1 cup of white vinegar and run jets for 15 minutes. This inhibits calcium scale and provides mild antibacterial action.
3. Drain and refill.

Alternatively, 2–3 tablespoons of low-suds dishwasher powder added to the full spa and run through the jets provides an enzyme and detergent flush that breaks down body oil and organic accumulation. Rinse thoroughly afterwards — residual dishwasher product can cause excessive foaming in subsequent uses.

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Dealing with Specific Spa Problems

Foamy Water

Foam in spa water (beyond what jets create naturally) is usually caused by accumulated body oil, soap, and product residue in the water or in the pipes. A foam-reducer product helps temporarily, but the real fix is a full pipe clean and water change.

Prevention: shower before using the spa. This is not just a nice habit — it dramatically reduces the amount of body oil, deodorant, hair product and cosmetics that enter the spa water.

Yellow or Brown Water

Discolouration when the jets first run typically indicates significant organic biofilm or mineral buildup in the pipes being dislodged. A full pipe clean addresses this.

Spa Smells Musty When Jets Are Running

A musty or "old water" smell from the jets is a reliable indicator of biofilm in the pipes. Schedule a pipe clean.

Jets Not Running Properly

Reduced jet pressure or jets that aren't flowing: likely calcium scale partially blocking the jet fittings. External cleaning of the jet fittings with vinegar and a toothbrush, and an internal flush with a descaling agent, addresses this.

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Routine Maintenance Schedule for Adelaide Spa Owners

Task	Frequency
Wipe basin after use	After every use
Full external basin clean	Weekly
Monthly pipe maintenance flush (vinegar or DIY)	Monthly
Full specialist pipe clean	Every 3–6 months
Check and replace filter cartridge	Every 3 months (more often with heavy use)
Check seal and jet fittings	Annually

Adelaide's hard water makes descaling a more important part of maintenance than in softer-water cities. If you notice calcium buildup on jet fittings within weeks of cleaning, increase the frequency of vinegar maintenance flushes.

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For spa bath cleaning as part of a bathroom deep clean in Adelaide, or for advice on spa maintenance products available in Adelaide, contact PF Cleaning Adelaide.

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Written by Victor Jacon — Master Cleaner & Home Detailing Specialist, Founder of PF Cleaning Adelaide.