Reverse Osmosis Filters vs Big Blue Whole House Filters.

Reverse Osmosis Filters vs Big Blue Whole House Filters: What’s the Difference?

Choosing the right water filtration system is essential for protecting your health, plumbing, and appliances. Two of the most common filtration solutions are Reverse Osmosis (RO) filters and Big Blue whole house water filters. While both improve water quality, they serve very different purposes.

In this guide, we break down the key differences between reverse osmosis systems and Big Blue filters, helping you decide which solution is best for your home or business.

What Is a Reverse Osmosis (RO) Water Filter?

A reverse osmosis water filtration system is a point-of-use filter, typically installed under a kitchen sink or connected to a dedicated drinking water tap.

How Reverse Osmosis Works

Reverse osmosis uses a semi-permeable membrane to remove dissolved contaminants by forcing water through the membrane under pressure. This process removes particles as small as 0.0001 microns.

What RO Systems Remove

• Dissolved salts and minerals (TDS)
• Heavy metals (lead, arsenic, mercury)
• Fluoride
• Nitrates
• Bacteria and viruses
• Chemical contaminants

Advantages of Reverse Osmosis Filters

✔ Produces very high-purity drinking water

✔ Excellent for borehole or high-TDS water

✔ Improves taste, smell, and clarity

✔ Ideal for drinking, cooking, and ice machines

Limitations of RO Systems

✘ Only filters water at one point (not the whole house)

✘ Slower filtration rate

✘ Produces some wastewater during filtration

✘ Requires regular membrane and cartridge replacement

What Is a Big Blue Whole House Water Filter?

A Big Blue filter housing is a point-of-entry filtration system, meaning it filters all the water entering your home or building.

How Big Blue Filters Work

Big Blue housings use large-capacity filter cartridges (typically 10” or 20”) to remove physical and chemical contaminants before water reaches taps, geysers, and appliances.

Common Big Blue Filter Media

• Sediment filters (sand, rust, dirt)
• Carbon block or granular activated carbon (chlorine, taste, odour)
• Iron or manganese reduction cartridges
• Scale inhibition filters

Advantages of Big Blue Whole House Filters

✔ Protects plumbing, geysers, and appliances

✔ High flow rates suitable for households and businesses

✔ Reduces chlorine, sediment, and bad taste throughout the home

✔ Lower maintenance compared to RO systems

Limitations of Big Blue Filters

✘ Does not remove dissolved salts or TDS

✘ Not designed to remove viruses or bacteria on its own

✘ Water quality depends on cartridge type used

Reverse Osmosis vs Big Blue Filters: Key Differences

Feature	Reverse Osmosis Filter	Big Blue Whole House Filter
Installation Point	Point-of-use (under sink)	Point-of-entry (main supply)
Filtration Level	Ultra-fine (dissolved solids)	Coarse to medium filtration
Flow Rate	Low to moderate	High
Removes TDS	✅ Yes	❌ No
Removes Chlorine & Sediment	✅ Yes	✅ Yes
Whole House Protection	❌ No	✅ Yes
Best For	Drinking & cooking water	Plumbing & appliance protection

Which Water Filter Is Best for You?

Choose a Reverse Osmosis System If:

• You want ultra-pure drinking water
• Your water has high TDS or borehole contamination
• Taste and chemical removal are your priority

Choose a Big Blue Whole House Filter If:

• You want to protect your entire plumbing system
• Your main issue is sediment, chlorine, or rust
• You need high flow rates for multiple taps

💡 Best Solution: Many homes use both systems together — a Big Blue filter for whole-house protection and a reverse osmosis system for drinking water.

Water Filtration Solutions from Pumps and Filters

At Pumps and Filters, we supply a wide range of:

• Reverse osmosis systems
• Big Blue filter housings
• Replacement cartridges
• Borehole and municipal water filtration solutions

Our experts can help you select the right filtration system for your water quality and application.

Visit www.pumpsandfilters.co.za to explore our products or contact us for professional advice.