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ScaleSoft® Salt-Free Scale Control Filter Cartridge | 20" x 4.5" | Replaces One Stop Plus | WaterMark (SS-20B)
- Replaces One Stop Plus GT4-86-OSP - Direct Drop-In Swap
- Whole House 20" x 4.5" Salt-Free Scale Control Cartridge
- No Salt, No Power, No Drain, No Regeneration
- 16 L/min Rated Flow, 21 L/min Peak Flow*
- Treats Hardness up to 1,400 mg/L
- Retains Calcium and Magnesium
- Cartridge Life Up to 2 years*
- WaterMark Certified, Certificate No. 23247 to AS 3497:2021
ScaleSoft® Salt-Free Scale Control Cartridge | 20" x 4.5"
ScaleSoft® is a cartridge that reduces the hard mineral scale building up in your plumbing, your appliances and your hot water system. No salt to buy, nothing to plug in, no drain to connect. It suits point-of-entry installation, treating the water for your whole home, or point-of-use installation directly before equipment such as dishwashers, washing machines and coffee machines.
This is the 20" x 4.5" size, for whole-of-home treatment in average to larger households and higher flow demand.
One Stop Plus is now ScaleSoft®
ScaleSoft® supersedes the One Stop Plus cartridge across the whole range. It works on the same salt-free scale-control principle, fits the housing you already have, and carries more rated flow at every size.
If you have been buying GT4-86-OSP, this cartridge (SS-20B) is your replacement. It is a direct swap. Same housing, same fittings, no plumbing changes.
What stays the same:
- The same working principle. Hardness minerals are conditioned into stable crystals rather than removed.
- Still no salt, no power, no drain and no regeneration cycle.
- Calcium and magnesium stay in the water, as they did before.
- Still helps reduce scale already present in the system.
- Fits the same 20" x 4.5" housing, with no plumbing changes.
- Still suited to point of entry and to single appliances.
What is the issue with hard water?
- It builds up inside kettles, dishwashers and coffee machines, and shortens their working life.
- It coats the elements in hot water systems and the inside of your pipework.
- It leaves spotting and film on taps, shower screens and glassware.
The level of hardness in your water depends on where your supply comes from. Many parts of Australia are known for soils with high mineral content, and hardness varies widely between regions.
How it works
Step 1. Water enters the cartridge. Hard water carries scale-forming calcium and magnesium, which are attracted to the ScaleSoft® media.
Step 2. The scale-control media converts those minerals into microscopic, stable crystals. Once the crystals become too large, they detach from the media.
Step 3. The crystals stay suspended and flow through with the water, instead of bonding to your pipes and elements.
Worth knowing. ScaleSoft® conditions hardness rather than removing it. It is a scale-control cartridge, not an ion exchange softener, which is exactly why it needs no salt, no power and no drain.
What you gain over One Stop Plus
| One Stop Plus | ScaleSoft® | |
|---|---|---|
| Scale control principle | Conditions hardness into stable crystals | Conditions hardness into stable crystals |
| Rated flow, 20" x 4.5" | 15 L/min | 16 L/min |
| pH range | 6.5 to 8.5 | 6.5 to 9.5 |
| Hardness, max | 1,300 mg/L | 1,400 mg/L |
| Operating temperature | 4 to 40 °C | 0 to 40 °C |
| Cartridge life | Over 12 months | Up to 2 years |
One Stop Plus figures are taken from the manufacturer's published datasheet and from our own product listing. ScaleSoft® figures are taken from its published specification.
Why people choose ScaleSoft®
- No salt or regeneration: nothing to refill and no regeneration cycle to run.
- No power or drain required: no electrical connection and no drain line, so it fits where a softener will not.
- Retains calcium and magnesium: the naturally occurring calcium and magnesium stay in your water.
- No intended change to pH or TDS: your water's pH and dissolved solids are not intentionally altered.
- Low-maintenance cartridge design: low maintenance, with just one cartridge replacement approximately every 2 years.
- Protects plumbing and appliances: helps protect pipes, hot water systems and appliances from scale build-up.
ScaleSoft® next to a salt-based softener
| ScaleSoft® | Salt-based softener | |
|---|---|---|
| Salt to buy and refill | None | Regular top-ups |
| Sodium added to your water | None | Yes |
| Calcium and magnesium | Stay in your water | Removed |
| Power connection | Not needed | Required |
| Drain connection | Not needed | Required |
| Water sent to backwash | None | Yes, on every regeneration |
| Ongoing upkeep | A cartridge change, about every two years | Salt, servicing and regeneration |
Important notes
ScaleSoft® conditions water to prevent and reduce scale, but it does not remove calcium or magnesium from the water. You may still see these minerals on surfaces where water is allowed to dry. Those deposits are less adherent and easier to clean than untreated water. On glass shower screens, squeegee or dry the glass after use to prevent spotting.
ScaleSoft® reduces the formation of hard mineral scale. It is not a disinfection or purification device, and it is not an ion exchange water softener. Suitable for mains and treated water. For rainwater tank supplies, talk to us first, as some water sources need testing or pre-treatment before installation.
For the full technical specification and operating limits, see the Specs/Performance tab.
Where it sits in your system
One Stop Plus was specified in the middle housing, with a filter after it. ScaleSoft® can take the final stage instead, which puts the carbon block ahead of it. Chlorine, taste and odour are taken out before the water reaches the scale-control media. That is easier on the cartridge and helps it run its full service life.
Typical triple-system order is shown. The same thinking applies to twin systems.
Reducing heavy metals
One Stop Plus carried a blended media that also offered some reduction of dissolved metals. ScaleSoft® is purpose-built for scale control, so where metal reduction is part of the specification, pair it with an LRC 0.5 micron coconut carbon block in the adjacent housing. This is the same upgrade already recommended alongside One Stop Plus. It is the dedicated route, and it matches the housing size one for one.
For this 20" x 4.5" size, pair with GT4-19LRCP5.
Choosing your size
| SS-10 | SS-10B | SS-20B (this product) | |
|---|---|---|---|
| Cartridge size | 10" x 2.5" | 10" x 4.5" | 20" x 4.5" |
| Rated flow | 4.5 L/min | 12 L/min | 16 L/min |
| Peak flow | 6.0 L/min | 15 L/min | 21 L/min |
| Replaces | GT4-79C | GT4-90-OSP | GT4-86-OSP |
| Suits | Point of use. Sized for a single appliance such as a coffee machine or ice maker. | Whole of home, in a 10 inch high flow housing. Suits small households. | Whole of home, for average to larger households and higher flow demand. |
Need a different size? SS-10, 10" x 2.5" or SS-10B, 10" x 4.5".
WaterMark certified
ScaleSoft® is certified to WaterMark Standard AS 3497:2021 under Certificate Number 23247. WaterMark certification is a mandatory requirement under Australian law for water filtration products to be installed by licensed plumbers. Products carrying this certification meet Australian plumbing and water safety standards.
ScaleSoft® is a product brand of High Performance Filtration.
Cartridge Specifications
| Model | SS-20B |
| Cartridge size | 20" x 4.5" |
| Rated flow | 16 L/min |
| Peak flow* | 21 L/min |
| Cartridge life | Up to 2 years** |
| Media | German-made scale-control media |
| Replaces | One Stop Plus GT4-86-OSP |
| Housing compatibility | Standard 20" x 4.5" high flow housings |
| Certification | WaterMark Certificate No. 23247, AS 3497:2021 |
| Recommended metal reduction pairing | GT4-19LRCP5 (0.5 micron LRC coconut carbon block) |
Operating Parameters
| Temperature | 0 to 40 °C |
| pH range | 6.5 to 9.5 |
| Hardness (carbonate) | 1,400 mg/L |
| Iron, max | 0.3 mg/L |
| Manganese, max | 0.05 mg/L |
| Free chlorine, max | 3 mg/L |
| Copper, max | 1.3 mg/L |
| Oil, hydrogen sulfide | Free |
Usage Guidelines
- Use on potable mains or treated water supplies only.
- For rainwater tank supplies, talk to us first. Some water sources need testing or pre-treatment before installation.
- Installation must comply with local plumbing codes, and the system should only be connected to the cold water line.
- Protect the system from freezing and do not expose it to temperatures below 0 °C.
- Flush the system for 30 seconds after periods of non-use exceeding 48 hours.
- Replace the cartridge every 2 years, or sooner if you experience reduced effect or notice sediment build-up.
Installation
Position in the system. ScaleSoft® can take the final housing, with the carbon block ahead of it. In a typical triple system the order is sediment, then carbon filter, then ScaleSoft®. This removes chlorine, taste and odour before the water reaches the scale-control media, which helps the cartridge run its full service life. The same thinking applies to twin systems.
Certification. This cartridge is certified to WaterMark Standard AS 3497:2021 under Certificate Number 23247. Installation must be carried out by a qualified plumber or authorised technician to comply with Australian Plumbing Codes.
WARNING. For correct operation of this system it is essential to observe the manufacturer's instructions.
CAUTION. Do not use with water that is microbiologically unsafe or of unknown quality without adequate disinfection before or after the system.
Footnotes
* Rated flow maintains scale protection efficiency. Peak flow can maintain scale protection for several minutes of constant flow, and is not the maximum flow rate of the cartridge. Flow exceeding peak flow may have a reduced scale protection effect.
** Replace the cartridge every 2 years, or sooner if you experience reduced effect or notice sediment build-up.
ScaleSoft® reduces the formation of hard mineral scale. It is not a disinfection or purification device, and it is not an ion exchange water softener.
Return Policy
Due to the nature of the products we sell, a strict return policy is in place. We work with food grade certified materials that must be un-opened and un-used as to be able to be re-sold.
You may receive a refund or credit of equal amount, less the restocking fee if applicable and any other deductions that are relevant.
- Wrongly purchased items may be returned for a merchandise credit, this applies for but not limited to: Wrong size, wrong system etc.
- 30 Day return Policy: Returns will not be accepted without prior approval or after 30 days of invoice date.
- All returns will incur a 17.5% restocking fee or cost to send the item to you whichever greater. FSA may use discretion to determine the restocking fee.
- Any damages (minor, that can be repaired) will incur a fee which will be deducted from the total refund which will be equal to the cost of the replacement
parts (List Price) and labour charge (if applicable) to repair the system(s). This will be separate to the restocking fee. - Any damage considered to be major and not feasible for repair may be refused and the return request will be void. The customer will be responsible for the return freight or disposal of the damaged unit.
- Return shipping is to be paid by the buyer to the address provided. It is recommended that the customer applies transit warranty to the return freight in case of damage.
- Any damages to the system that were not reported to FSA within 48 business hours of receipted delivery are not covered under our transit warranty.
- Should the item appear faulty or doesn’t work how described, the unit/item must be returned for testing (if requested), the return postage paid by the buyer. If the unit/item is deemed to be faulty, compensation will be provided for the postage cost (Proof of cost required). If the unit/item is deemed to be in working order and as described, the buyer will responsible for return postage.
If you have any questions about our return policy, please contact us before purchase. This will also help to ensure you purchase the correct product that suits your requirements.