Monarch Scaleout Advance: The Complete, Salt-Free Guide (SA-15, SA-22, SA-28 & SA-LC)
Everything you need to know about scale prevention and whole-house filtration—how it works, what to choose, and how to install it the right way.
Why Choose Monarch Scaleout Advance?
- Whole-house protection: Prevent limescale build-up in kettles, taps, boilers, showers, and pipework.
- Cleaner, better-tasting water: Filtration removes chlorine, odours, and a range of organic contaminants for every tap.
- Salt-free & low maintenance: No power, no drain, no salt refills. Typically just one cartridge change per year.
- Anti-microbial housing: Added peace of mind built into the filter design.
- Reliable coverage: Industry-leading parts & labour warranties from Monarch.
Quick Pick: Which Model Fits Your Plumbing?
SA-15 • 15 mm supplies
Best for flats & smaller homes. Max flow ~30 lpm. 3/4″ MBSP connections.
View SA-15 →
SA-22 • 22 mm supplies
Great all-rounder for family homes. Max flow ~45 lpm. 3/4″ MBSP connections.
View SA-22 →
SA-28 • 28 mm supplies
High-demand households with multiple bathrooms. Max flow ~60 lpm. 1″ MBSP.
View SA-28 →
SA-LC • Light commercial
For cafés, salons, B&Bs, and larger properties. High flow with 1″ MBSP kit.
View SA-LC →
How Scaleout Advance Works (Salt-Free)
Traditional softeners swap calcium and magnesium ions for sodium using salt and a backwash drain. Monarch Scaleout Advance takes a different, salt-free approach: water passes through a high-performance media and anti-microbial filter housing that conditions hardness minerals and filters taste/odour-causing substances. The conditioned minerals are less likely to adhere to surfaces, reducing new limescale formation while also improving water clarity and taste across the home.
Key benefits of salt-free conditioning: no brine discharge, no power, simple install, and minimal maintenance (typically annual cartridge change). It’s ideal for households wanting the benefits of scale control and whole-home filtration without the footprint of a traditional softener.
Monarch SA-15 (15 mm) — Compact Protection + Filtration
The SA-15 is designed for homes with 15 mm pipework. It ships with a full installation kit and 3/4″ MBSP connections for a straightforward fit. With a maximum flow around 30 lpm, it suits flats and smaller properties that still want whole-house filtration and scale control at every outlet.
- Connection: 3/4″ MBSP • Pipe compatibility: 15 mm
- Max flow: ~30 lpm • Typical pressure range: 1–5 bar
- Operating temp: approx. 2–49 °C
- Annual cartridge change recommended
Monarch SA-22 (22 mm) — The Family-Home Sweet Spot
Stepping up from the SA-15, the SA-22 suits standard UK homes with 22 mm supplies, balancing strong flow and filtration performance. Expect a maximum flow around 45 lpm, anti-microbial housing, and the same low-maintenance ownership experience.
- Connection: 3/4″ MBSP • Pipe compatibility: 22 mm
- Max flow: ~45 lpm • Typical pressure range: 1–5 bar
- Operating temp: approx. 2–49 °C
- Annual cartridge change recommended
Monarch SA-28 (28 mm) — High-Flow, Multi-Bathroom Champion
For larger properties and higher simultaneous demand (multiple showers plus kitchen use), the SA-28 is built for 28 mm supplies and includes 1″ MBSP ultraflow connections. With a maximum flow around 60 lpm, it’s the robust choice when you need whole-home protection without compromising water pressure.
- Connection: 1″ MBSP • Pipe compatibility: 28 mm
- Max flow: ~60 lpm • Typical pressure range: 1–5 bar
- Operating temp: approx. 2–49 °C
- Annual cartridge change recommended
Monarch SA-LC (Light Commercial) — Salt-Free Control for Business
The SA-LC brings the same salt-free scale control and filtration benefits to light commercial settings—think cafés, salons, small hospitality, and larger homes. It’s supplied with a full installation kit and high-capacity connections for reliable flow across multiple outlets.
- Intended use: light commercial / higher-demand domestic
- High-capacity housing and 1″ MBSP installation kit
- Annual cartridge change recommended
Side-by-Side Comparison
How to Choose the Right Scaleout Advance
- Match your pipe size: Most UK homes are 15 mm (SA-15) or 22 mm (SA-22). Larger properties often use 28 mm (SA-28). Commercial-leaning? Consider SA-LC.
- Estimate demand: Count simultaneous uses (e.g., two showers + tap). Pick a model whose max-flow comfortably exceeds typical peak demand.
- Future-proofing: If you’re planning an extension, extra bathroom, or loft conversion, size up to avoid pressure drop later.
- Maintenance plan: Add a yearly reminder for the cartridge change. Keep a spare cartridge on site to avoid downtime.
Installation Best Practices
Good news: Scaleout Advance units do not require power or a drain, making them simpler than salt-based softeners. Still, correct placement and commissioning matter:
- Location: Fit on the incoming main after the stop tap but before branch lines, with enough clearance to service the housing.
- Orientation: Follow the flow direction arrow on the head; keep vertical if possible to ease cartridge changes.
- Isolation: Use the supplied flexible hoses and isolation valves to simplify future maintenance.
- Pressure: Operate within the recommended pressure band (typically 1–5 bar). If your static pressure is high, add a PRV.
- Commissioning: Flush thoroughly after install to clear any air and fines; check all joints for leaks.
Maintenance & Replacement Cartridges
Most users replace the cartridge annually (water quality and usage can vary). A fresh cartridge maintains scale control and keeps taste and odour reduction at peak performance.
- Shut off water and isolate the housing.
- Depressurise, unscrew housing, and replace the cartridge.
- Re-pressurise and check for leaks; run taps for a short flush.
Tip: stock a spare cartridge so annual service is quick and you avoid ordering delays.
FAQs
Does salt-free scale control feel the same as traditional softening?
Salt-based softeners reduce hardness by ion exchange, creating the classic “silky” feel. Salt-free conditioning focuses on preventing scale adhesion while leaving hardness minerals present. You still get strong limescale prevention and whole-home filtration without brine discharge, power, or drain connections.
Will it remove existing limescale?
Salt-free systems primarily prevent new scale from sticking. Over time, treated water can help reduce existing deposits, especially on dynamic surfaces, but the main benefit is protecting against future build-up.
What about water pressure and flow rate?
Choose a model that matches your pipework and expected peak flow. For example, SA-15 ~30 lpm, SA-22 ~45 lpm, and SA-28 ~60 lpm. Overspec for multi-bathroom properties.
How often do I change the cartridge?
Typically once a year under normal household usage. High usage or poorer water quality may require more frequent changes.
Is installation DIY or professional?
Many competent DIYers can install with the supplied kit, but we recommend using a qualified plumber—especially for homes with complex manifolds or higher-than-average demand.
Ready to Protect Your Home from Limescale?
Pick the model that matches your pipework and demand, then enjoy scale protection and better-tasting water—without salt, power, or a drain.
