How to Fix Efflorescence Around Your Pool—And Keep it Gone for Good
A chalky white residue appearing on poolside pavers or concrete is often a sign of efflorescence, a visible indication that moisture is migrating through masonry materials. This salt deposit is not only unsightly but also persistent, and if left untreated, can gradually compromise the strength and durability of the surface.
Fortunately, remediation does not require removing or replacing the affected area. With appropriate cleaning techniques and the application of a high-quality penetrating sealer, efflorescence can be effectively removed and its recurrence significantly reduced.
What Is Efflorescence—and Why Does It Happen?
Efflorescence is the white, powdery salt deposit that appears on masonry surfaces like concrete, brick, or stone. It forms when water moves through the material, dissolving salts inside, and carries them to the surface. When the moisture evaporates, the salts remain.
It’s especially common around pools, decks, and garden walls where water exposure is frequent and drainage may be inconsistent. While it’s not harmful to people, efflorescence can:
- Make surfaces look dirty or aged
- Weaken masonry over time by highlighting moisture movement
- Signal deeper issues like leaks or poor drainage
How to Remove Efflorescence (DIY-Friendly)
Step-by-Step Cleaning:
- Pre-soak the surface with clean water to prevent acid from penetrating too deeply.
- Apply white vinegar for light deposits, or use a diluted phosphoric acid solution for stubborn buildup. (Hydrochloric acid can work but should be used cautiously—it may etch concrete or damage grout. Always test in a hidden area first.)
- Let it sit for 5–10 minutes. Bubbling may occur as the acid reacts with the salts.
- Scrub with a stiff plastic bristle brush, especially in edges and corners.
- Rinse thoroughly with clean water and allow the surface to dry completely.
Safety Tip: Always wear gloves, eye protection, and protective clothing when handling acids. Avoid metal brushes, as they can leave rust stains.
How to Prevent Efflorescence from Coming Back
Cleaning solves the symptom, but prevention stops the problem at its source. To keep efflorescence from returning, you need to keep moisture out of the masonry. The most effective solution? A penetrating silicone-based sealer like Tech-Dry’s range of sealers. These products:
- Repel water while allowing the surface to breathe
- Prevents salt migration to the surface
- Protects against staining and weathering
- Won’t change the look or feel of your masonry
- Won’t create a slippery film—ideal for poolside and alfresco areas
Unlike surface coatings, penetrating sealers soak into the material—so there’s no film, no slipperiness, and no change in appearance.
Fix the Source of Moisture
Efflorescence often points to a bigger issue. To keep your masonry dry:
- Check for leaking downpipes or gutters
- Improve drainage around the pool or patio
- Avoid pooling water near walls or paved areas
- Seal joints and cracks where water might enter
A good sealer helps—but eliminating moisture at the source is the long-term fix.
Why Choose Tech-Dry?
Tech-Dry has been developing Australian-made waterproofing solutions for decades. Our sealers are:
- Water-based and low-VOC
- Easy to apply with brush, roller, or sprayer
- Backed by field-tested performance
- Trusted by builders, landscapers, and DIYers across Melbourne and beyond
From restoring pool decks to protecting newly built alfresco areas, Tech-Dry offers straightforward solutions to seal, safeguard, and maintain masonry surfaces with lasting results.
Clean, Seal, Relax
Efflorescence may appear as a stubborn surface stain, but it often signals an underlying moisture issue within masonry or concrete. When addressed with appropriate cleaning techniques and a high-performance penetrating sealer, affected surfaces can be effectively restored and protected, avoiding the need for costly repairs or replacement. Silane-based sealing products offer a smart, long-term solution for maintaining the appearance and durability of poolside masonry and concrete finishes.
Check out our silane-based products for masonry and concrete sealing and protect your poolside surfaces the smart way.