(DG) Note: This product cannot be shipped. It can be purchased at any of our stores. Store Locations.
Zodiac Calcium Down Scale & Stain Control 1L – Pool Chemical (DG)
Calcium hardness treatment for reducing scale and staining caused by high calcium levels in pool water.
$35.00
- Buy 2 for $31.00 each and save 11%
- Buy 3 for $28.00 each and save 20%
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Reduce Scale and Staining from High Calcium Hardness
Zodiac Calcium Down helps manage high calcium hardness in pool water, reducing scale formation, staining risk and cloudy water caused by elevated calcium levels. It supports clearer water while helping protect pool surfaces, heaters and salt chlorinator cells from calcium build-up.
High calcium levels can make pool surfaces feel rough and cause scale to form on equipment that works hard every day. By keeping calcium in suspension, Calcium Down helps maintain better water balance in pools affected by hard source water, mineral water or ongoing calcium build-up.
Features & Benefits
- Reduces scale from high calcium hardness: Helps decrease scale formation caused by elevated calcium levels in pool water.
- Helps reduce staining risk: Supports stain prevention by helping keep calcium and trace metals in solution.
- Supports clearer water: Helps prevent cloudy water linked to high calcium hardness.
- Helps protect pool surfaces: Reduces conditions that can cause rough scale build-up on pool surfaces.
- Helps protect equipment: Supports scale control in heaters, pipework and salt chlorinator cells.
- Compatible with common pool sanitisers: Can be used in pools with standard sanitising systems.
Dosage & Coverage
- Calcium Down Dose: 1L chelates calcium and can reduce the calcium hardness reading by approximately 100ppm per 40,000 litres of pool water.
- Frequency: Reapply as needed to maintain the desired result. As a guide, maintenance dosing may be required approximately every 5 weeks.
Important Usage Information
- Always test pool water before dosing and follow the product label directions.
- Aim to keep Calcium Hardness within the ideal range for your pool surface: 200–300ppm for most pools, or 150–250ppm for fibreglass pools.
- Calcium Down helps hold calcium in suspension. It does not permanently remove calcium from pool water.
- If total hardness is above 800ppm, check whether the pool is a mineral pool or whether bore water or hard source water is contributing to the reading.
- Contains phosphonic acid, which can elevate phosphate readings. Do not treat phosphates at the same time, as this may reduce the effectiveness of Calcium Down.
- Temporary changes in water colour or clarity may occur during application. Water clarity should return once treatment is complete.
This product is classified as Dangerous Goods. Handle with care, avoid contact with skin and eyes, and keep out of reach of children.
A Better Pool Experience Starts with the Right Chemistry
Zodiac pool chemicals support the key parts of everyday water care, from balance and sanitising to algae prevention, clarity, stain control and equipment protection.
Each product has a clear role in helping pool water stay cleaner, more comfortable and easier to manage, so the pool feels ready to enjoy more often.
Frequently Asked Questions
Does Zodiac Calcium Down remove calcium from the pool?
No. Calcium Down helps chelate calcium and hold it in suspension, which can reduce the calcium hardness reading and help control scale. The only true way to physically remove calcium from pool water is by dilution with fresh water.
Why is high calcium hardness a problem?
High calcium hardness can contribute to scale formation, cloudy water and rough pool surfaces. Scale can also affect heaters, pipework and salt chlorinator cells, making equipment work harder over time.
Why did my water colour or clarity change after adding Calcium Down?
Temporary changes in water colour or clarity can occur during treatment, especially when calcium levels are high. Continue filtration and monitor the pool as directed. Water clarity should return after the treatment process is complete.
Can Calcium Down affect phosphate readings?
Yes. Calcium Down can contribute to phosphate readings. If you are also managing phosphates, avoid treating both issues at the same time.
What should I check if total hardness is above 800ppm?
If total hardness is very high, check whether the pool is a mineral pool or whether bore water or hard source water is contributing to the result. In some cases, dilution with fresh water may be needed to physically reduce calcium content.
Image shows product in new packaging design. Actual product received may vary while previous label design is being sold through.
| SKU | WPQCHD1 |
|---|---|
| GTIN | 9343609024758 |
| Barcode | WPQCHD1 |
| Brand | Zodiac |
| Model | WPQCHD1 - Calcium Down 1L Bottle |
| Product Type | Pool Chemical |
| Shipping Type | Standard |
| Chemical Type | Balancers |
| Chemical Function | Calcium Down, Scale Inhibitor / Scale Stop |
| Active Constituents | Hydroxyethylidene Diphosphonic Acid Complex: 370g/L |
Shipping
Same-day dispatch applies to orders received by 12.00 pm (AEST) during business days. Orders received after 12.00 pm and on weekends or public holidays will be dispatched on the next business day.
Delivery fees are $19.95 flat-rate per order Australia-wide, no matter how many products are in it. Orders containing bulky items like sand filters, acoustic boxes, heat pumps, pool covers, and pool slides may incur additional fees as they require specialized carriers.
Below are the estimated time to arrival in business days once an order is shipped.
| Destination | Sydney | NSW | VIC | QLD | SA | WA/NT |
|---|---|---|---|---|---|---|
| Business Days | 1 - 2 | 2 - 4 | 2 - 4 | 2 - 4 | 3 - 4 | 5 - 6 |
Rural and remote addresses, where delivery is not provided every day, may take longer.
Returns
Satisfaction Guarantee: If you are not satisfied with a product for any reason, you are welcome to return it to us for a full refund or exchange within 30 days of the purchase date - even if you have used the product. Returns are free, and we will cover return shipping.
We take full responsibility for the safe arrival of the products that you order from us. We will replace at our expense any product that arrives faulty, damaged during transit, or is the incorrect product. Click here for details
If you have any questions about our shipping policy or our return policy, please contact us on 1300 766 619 or through our contact us form.