GRO‑475B (4‑Stage RO System) replacement Parts

Enjoy cleaner, better-tasting water at home with our selection of high-performance reverse osmosis (RO) systems. These systems use multi-stage filtration—including sediment, carbon, and membrane filters—to remove up to 99% of contaminants like lead, chlorine, fluoride, nitrates, and more.

Whether you're upgrading an existing system or installing one for the first time, we offer high-quality reverse osmosis units — all shipped fast and reliably from within Canada.

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NSF-Certified Product Options

NSF-Certified Options Available

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We Ship Canada-Wide

Fast Shipping Across Canada

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Free System Recommendations

Free Expert Help Available

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Canadian-Owned & Operated

Proudly Canadian-Owned

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Why Choose Reverse Osmosis?

  • Advanced Contaminant Removal

    RO systems reduce heavy metals, bacteria, viruses, and harmful chemicals.

  • Improved Taste & Odour

    Enjoy fresh, crisp water right from your tap.

  • Eco-Friendly

    Reduce single-use plastic bottles by filtering water at home.

  • Cost-Effective

    Save money long-term vs. bottled water or delivery services.

Not Sure What You Need?

We’ll help you choose the right reverse osmosis system for your home.

Just fill out the quick form below — we’ll get back to you with a personalized recommendation.

Find the Right System

Replacement Filters Available

We carry all compatible cartridges and membrane replacements for these systems:

Each product page includes filter compatibility for easy reordering

Frequently Asked Questions

A reverse osmosis system uses multi-stage filtration — including a membrane — to remove up to 99% of contaminants like lead, chlorine, fluoride, nitrates, and more from your water.

What does an RO system remove?
 RO systems remove:

  • Heavy metals (like lead, mercury, arsenic)
  • Chlorine and chloramine
  • Fluoride
  • Sediment, rust, and dirt
  • Nitrates, sulfates, and more
  • Bad taste and odour

Most systems require:

  • Pre-filters: every 6–12 months
  • Membrane: every 2–3 years
  • Post-filters: every 12 months
    (Your system’s manual will have exact timelines.)

Modern RO systems are much more efficient than older ones. Some high-efficiency models use as little as 1 gallon of waste per 1 gallon of filtered water.

Many under-sink RO systems are designed for easy DIY installation and include all parts. If you’re not comfortable installing it, a plumber or handyman can typically do it in under an hour.

Yes — reverse osmosis removes most minerals. However, this does not make the water unhealthy. You can add a remineralization filter if preferred.

It depends on your water quality. RO systems remove more contaminants than standard carbon filters, making them ideal for those wanting the cleanest water possible.