pH Increaser Soda Ash 4kg | Pool & Spa pH Up
Low pH making your pool uncomfortable? pH Increaser (Soda Ash) is the fast, reliable way to raise pH in swimming pools and spa pools, protecting your swimmers, your equipment, and making sure your chlorine actually works.
When pH drops below 7.2, chlorine loses up to 50% of its effectiveness, water becomes corrosive to fittings and surfaces, and swimmers experience stinging eyes and irritated skin. A quick dose of Soda Ash fixes all of that.
Product Specifications
| Active Ingredient | Sodium Carbonate (Soda Ash) |
| Size | 4kg |
| Target pH (Pools) | 7.2 - 7.6 |
| Target pH (Spas) | 7.2 - 7.8 |
| Suitable For | All pool and spa types |
| Packaging | Resealable moisture-resistant pail |
Key Features
- Sodium Carbonate Formula. Fast-dissolving Soda Ash raises pH reliably without overcorrecting.
- Fast-Acting. pH begins rising within 30-60 minutes of application.
- Dual-Purpose. Suitable for swimming pools and spa pools of all types.
- Prevents Corrosion. Protects pool shell, fittings, and equipment from acidic water damage.
- Boosts Chlorine Efficiency. Chlorine works best at correct pH levels, maximising sanitiser value.
Dosing Guide
Spa Pools:
- Add 1 teaspoon (7g) per 1,000L to raise pH by approximately 0.5
- Dose gradually, retest after 30 minutes before adding more
- Always run jets while dosing for even distribution
Swimming Pools:
- Add 500g per 50,000L to raise pH by approximately 0.5
- Pre-dissolve in a bucket of water before adding to the pool
- Allow 6 hours of pump circulation, then retest
- Apply near a return jet for best distribution
Tip: Always test pH before and after dosing. Target 7.2-7.6 for pools, 7.2-7.8 for spas. Never add more than the recommended dose in a single application.
Available Sizes
- 1kg Pail - ideal for spas or small top-up doses
- 4kg Pail (this product) - most popular for regular pool maintenance
- 10kg Pail - best value for large pools or frequent use
Recommended Accessories
- Crystalline Chlorine 4kg - sanitise at the correct pH for maximum effectiveness.
- Alkalinity Increaser 4kg - stabilise Total Alkalinity first to make pH easier to control.
- 5-in-1 Test Strips - test pH, chlorine, and alkalinity before and after every dose.
- Spa Pool Starter Kit - includes pH Increaser plus everything needed for a fresh fill.
Frequently Asked Questions
Q: How quickly does pH Increaser work?
A: pH begins rising within 30-60 minutes of application. Allow 6 hours of full circulation before retesting and re-dosing if needed.
Q: Can I add pH Increaser and chlorine at the same time?
A: No, always adjust pH first, wait 6 hours, then add chlorine. Adding both together reduces the effectiveness of both chemicals.
Q: What if I add too much?
A: High pH (above 7.8) causes cloudy water and reduces chlorine effectiveness. Use a pH Decreaser (Sodium Bisulphate) to bring it back down.
Q: How often will I need to adjust pH?
A: Test weekly during summer and after heavy rain or high bather load. Spas should be tested after every use.
Q: Is this safe for all pool types?
A: Yes, safe for concrete, fibreglass, vinyl liner, and tiled pools, and all spa pool types.
Pickup and Delivery
Perfect Pools Service Warehouse - 15C Douglas Alexander Parade, Albany, Auckland
Hours: Mon-Fri 9am-4pm | Sat 10am-2pm
NZ-wide delivery available. Charges calculated at checkout.
Questions? Email perfectpoolsnz@gmail.com or visit our contact page.
