How to Maintain Your Spa? Complete Guide to Market Spas Maintenance Products
Dec 17, 2025
A well-maintained spa ensures healthy water, long-lasting equipment, and optimal comfort every time you use it. A few simple steps are enough to protect your investment and fully enjoy your relaxation time.
This complete guide explains how to use each maintenance product, how often, and in what order to keep your water crystal clear all year round.
📋 Summary
- The weekly routine
- All-In-One — Complete treatment
- Slow chlorine — Continuous disinfection
- pH+ and pH- — Water balancing
- Defender — Anti-limescale
- Metal Clear — Metal Remover
- Filter Cleaner — Filter cleaning
- Spa Cleaner — Pipe cleaning
- Foam Down — Anti-foam
- Common problems and solutions
- Maintenance schedule
- Product pricing
WARNING — Protect your spa’s acrylic: Using unsuitable products can cause osmosis, a chemical reaction that gradually damages the surface of the shell. Use only spa-specific products (not pool products) that resist high temperatures.
Never: use rainwater, add essential oils to the spa, or use pool products. Spa products are formulated to withstand higher temperatures and dissolve better in warm water.
📅 Weekly maintenance routine
Each week, perform this simple treatment to keep your water perfectly balanced and disinfected.
🔄 Your weekly routine in 4 steps
- Measure the amount of All-In-One according to the instructions on the bottle (usually 100ml per 1000L of water)
- Pour the solution directly into the spa water
- Run the pumps for 2 minutes to distribute the product evenly
- Add a slow chlorine tablet to the skimmer or a floating dispenser
Recommended filtration time: Minimum 8 hours per day for normal use. Adjust according to water volume and spa usage frequency.
💧 All-In-One — The complete weekly treatment
All-In-One Duo
79,00 € / 2LThe All-In-One is your main weekly maintenance product. It is a multifunctional treatment that balances the water, prevents algae growth, and optimizes disinfectant effectiveness.
📋 Instructions for use
- Measure the amount according to the instructions on the bottle
- Pour the solution directly into the spa water
- Run the pumps for 2 minutes
- Add a slow chlorine tablet to the skimmer
🧪 Slow chlorine — Continuous disinfection
Slow chlorine — 20g tablets
€20.00 / 1kgThe slow-dissolving chlorine tablets provide continuous disinfection of your spa water. They dissolve gradually to maintain a stable disinfectant level between treatments.
📋 Instructions for use
- Calculate the number of tablets based on your spa volume (1 tablet per 2m³)
- Place the tablet(s) in the skimmer or a floating dispenser
- Renew every 5 to 7 days
- Regularly check chlorine levels with test strips
Important: Never put chlorine tablets directly into the spa shell! Direct contact with acrylic can cause discoloration. Always use the skimmer or a floating dispenser.
⚖️ pH+ and pH- — Balance your spa water
The pH is a key parameter to maintain healthy and comfortable water. An unbalanced pH can reduce disinfectant effectiveness, cause skin irritation, and damage equipment.
🎯 The pH scale — Aim for the ideal range
⬇️ pH too low (< 7.2)
The water is acidic, which can cause corrosion of spa components and irritation for bathers.
Solution: Use pH+ to raise the pH.
⬆️ pH too high (> 7.8)
The water is basic, promoting limescale deposits and reducing disinfectant effectiveness.
Solution: Use pH- to lower the pH.
pH+ and pH- — pH Correctors
€13.95 / 1L eachpH correctors adjust the water's acidity level to ensure treatment effectiveness and user comfort.
📋 Instructions for use
- Test the water pH with test strips or an electronic tester
- If the pH is outside the 7.2-7.6 range, calculate the amount of corrector needed based on the water volume
- Dissolve the required amount in a bucket of water
- Pour into the running spa (pumps on)
- Wait 2 hours then retest the pH
🛡️ Defender — Anti-limescale Protection
Defender — Anti-limescale
21,95 € / 1LThe Defender prevents limescale deposits and extends the lifespan of spa components. Essential if you have hard water.
Signs of a limescale problem:
- Cloudy or milky water
- Rough walls to the touch
- White deposits on the shell (especially with the cover closed)
- Jets losing power
📋 Instructions for use
- Add the recommended dose directly into the spa water
- Run the filtration for 1 hour
- Renew every week along with the All-In-One treatment
🔧 Metal Clear — Metal Protection
Metal Clear — Metal Remover
22,50 € / 1LThe Metal Clear neutralizes metals in the water (iron, copper, manganese) to prevent stains and discoloration of the acrylic shell.
📋 Instructions for use
- Fill your spa with clean water
- Add the recommended dose of Metal Clear immediately
- Run the pumps for a few minutes
- Then proceed with the usual treatment (All-In-One + Chlorine)
Benefit: Metal Clear protects acrylic and equipment from metal deposits that can cause stubborn brown or green stains.
🧹 Filter Cleaner — Filter Cleaning
Filter Cleaner — Filter Cleaner
€24.95 / 500gThe Filter Cleaner dissolves grease, oils, and limescale deposits to maintain your filters’ efficiency. Clean filters = clear water and a well-functioning spa.
📋 Instructions — Filter Cleaning
- Remove the filter from the skimmer
- Place it in a bucket of warm water
- Sprinkle 2 doses of Filter Cleaner directly onto the filter
- Let soak for 1 to 1.5 hours, turning the filter occasionally
- Rinse thoroughly with a strong water jet
- For best results, use a special filter brush
- Put the clean filter back into the skimmer
When to change filters? Replace your filters every 6 months, even if they look fine. Over time, the mesh loosens and lets more impurities through. A clogged filter can damage the spa.
🚿 Spa Cleaner — Pipe Cleaning
Spa Cleaner — Pipe Cleaner
€24.95 / 500mlThe Spa Cleaner deeply cleans the pipes and internal spa components. Over time, a biofilm (layer of bacteria and organic residues) forms inside the plumbing. This product effectively removes it.
📋 Instructions — The day before draining
- Remove and clean the filter (important!)
- Add 250 ml of Spa Cleaner to the spa water
- Open all jets and air valves
- Run the pumps for 15 minutes
- Let it work for 24 hours (do not use the spa)
- The next day, run the pumps 2× for 15 minutes
- Drain the spa and rinse thoroughly with a garden hose
- Replace the clean filter and refill with fresh water
Important: Do not use the spa during the cleaning process (24h). Spa Cleaner lifts impurities from the pipes; the water is not safe for bathing during this time.
🫧 Foam Down — Anti-foam
Foam Down — Anti-foam
€18.50 / 500mlFoam Down quickly removes surface foam without leaving residues. Foam can be caused by body product residues (creams, soaps, makeup) or excess disinfectant.
📋 Instructions for use
- Shake the bottle before use
- Spray directly on the foam
- The foam disappears within seconds
Tip: To prevent foam formation, ask users to rinse before entering the spa (sunscreens, soaps, etc.). Persistent foam can also indicate it's time to change the water.
🔍 Common problems and solutions
💧 My water is cloudy
Milky water, grainy walls, white deposits on the shell.
✅ Solution
- Check and clean filters
- Increase filtration to at least 8h/day
- Correct pH (7.2-7.6)
- Use Defender every week
- If persistent, add a clarifier
🟢 My water is greenish
Algae growth due to lack of disinfectant or unbalanced pH.
✅ Solution
- Check and adjust pH
- Perform the All-In-One treatment
- Temporarily increase chlorine dose
- Increase filtration time
👃 My water smells bad
Unpleasant odor usually related to water imbalance.
✅ Solution
- Identify the water color (see above)
- Clean the filters
- Check the disinfectant level
- If persistent, drain and clean the pipes
🫧 Foam appears
Surface foam caused by body residues or excess products.
✅ Solution
- Use Foam Down to remove foam
- Ask users to rinse before
- If persistent, consider changing the water
🌡️ My spa is not heating
Heating problem that can have several causes.
✅ Solution
- Check if an error code is displayed
- Clean the filters (clogged filters = disrupted heating)
- Check the water level
- Contact technical support if the problem persists
Limescale deposits
White marks on the shell and equipment.
✅ Solution
- Use Metal Clear at each filling
- Use Defender every week
- Keep pH between 7.2 and 7.6
📆 Complete maintenance schedule
| Product / Action | Frequency | Time |
|---|---|---|
| All-In-One | Weekly | Every week, fixed day |
| Slow chlorine | Every 5-7 days | After the All-In-One treatment |
| pH check | Weekly | Before each treatment |
| Defender (anti-scale) | Weekly | With the All-In-One treatment |
| Filter cleaning | Every 1-2 weeks | Depending on use |
| Foam Down | As needed | As soon as foam appears |
| Metal Clear | At each filling | Immediately after filling |
| Spa Cleaner | Every 3 months | The day before draining |
| Complete drain | Every 3-6 months | Depending on use |
| Filter replacement | Every 6 months | Even if in good apparent condition |
💰 Maintenance product prices
| Product | Quantity | Price |
|---|---|---|
| Duo All-In-One (refill) | 2 L | 79,00 € |
| Metal Clear | 1 L | 22,50 € |
| Defender | 1 L | 21,95 € |
| Spa Cleaner | 500 mL | 24,95 € |
| Foam Down | 500 mL | 18,50 € |
| Filter Cleaner | 500 g | 24,95 € |
| pH+ | 1 L | 13,95 € |
| pH- | 1 L | 13,95 € |
| Slow chlorine (20g tablets) | 1 kg | 20,00 € |
| Filters | 1 piece | 39,90 € |
| Liquid Aroma (Spring Flower, Orchid Summer, Haitan Coconut, Eucalyptus) | 200 mL | 15,00 € |
🎁 Our Value Packs
3-Month Pack
- 2 × 1L All-In-One
- 15 × 20g Slow Chlorine Tablets
- 1 × Dispenser
- 1 × Microfiber
Swim Spa Pack
- 26 × 100g All-In-One Doses
- 30 × 20g Slow Chlorine Tablets
- 1 × Dispenser
- 1 × Microfiber
Free shipping on orders over €150 — Order your products at marketspas.com or by email at service@spas-wellis.com
Need maintenance products?
Find all our spa maintenance products in our online store or at our showrooms in Belgium.
