Sealing guide · Perth
How bore water ruins glass and stone in Perth.
Perth bore and reticulation water runs heavy with iron and lime. The iron oxidises and stains stone orange. The lime dries on glass and slowly etches it. Here's what those marks actually are, what still cleans off, what has bonded on for good, and how a coating buys you a wipe instead of a razor blade.
The short answer
Two minerals, three kinds of damage.
Most Perth reticulation runs off a backyard bore, and that groundwater is loaded with dissolved iron and hard lime. Sprinklers spray it over paving, limestone walls, render and glass, and the sun dries it on before anyone rinses it off. Two minerals do nearly all the damage, and they leave three signatures. Two of them will often still clean up if you catch them. One won't, because by then it isn't sitting on the surface, it's part of it.
Iron
Orange staining on stone
Dissolved iron hits the air and oxidises, the same reaction as rust, and leaves an orange to brown stain on paving, limestone and render. Manganese in the same water can add darker, near-black marks. It builds worst in the fan where a sprinkler hits the same spot every cycle.
Lime
White scale and crusting
Hard lime dries into a chalky white film and crust, most obvious on dark stone, around pools and along the run lines where retic pools and evaporates. Caught early it's a deposit on the surface. Left to stack up it keys in harder and starts to hold dirt.
Lime on glass
Etched glass
On windows and glass pool fencing the overspray dries and spots. Cycle after cycle that scale bonds to the glass and, given time, etches the surface itself. That haze is loss of the glass, and no cleaner brings it back.
The pattern that gives it away: bore-water damage usually points back at a sprinkler head. A fan of orange on a wall, a run line of white along a path, spotting worst on the fence panels nearest the retic. If your marks line up with where the water sprays, this is what you're looking at.
The fork that matters
What still cleans off, and what's bonded on for good.
Before you buy a cupboard of cleaners, work out which side of the line your marks are on. The difference is whether the mineral is still sitting on the surface or has soaked in and set. It changes everything about what to do next.
Fresh iron on the surface: usually comes off
Caught reasonably early, iron staining sits on top of the stone. A purpose-made rust and iron remover formulated for stone will often draw it out. Go gently, test a patch first, and keep it off polished and acid-sensitive surfaces. The sooner you get to it, the better it lifts.
Iron soaked into the pore: usually there for good
Once iron has run down into raw limestone or concrete and oxidised in the pores, it is bonded into the mineral and pore structure. A poultice can sometimes pull some back, but deep staining in porous stone is often permanent. This is the outcome sealing exists to prevent.
Fresh lime scale: comes off with the right chemistry
White scale on stone or a pool surround is alkaline, so a mild acidic hard-water remover dissolves it, given dwell time rather than muscle. Keep acid off polished marble, honed stone and metal fittings, rinse well, and expect it back in weeks on a bare surface with retic still hitting it.
Etched glass: does not come off
If your windows or glass fence look hazy dry but clear up when you wet them and haze again as they dry, the surface itself is etched. That is damage in the glass, not on it. No cleaner fills it back in, and eventually the panel gets replaced.
The honest catch: even when you win the clean, a bare surface gives the next lot of iron and lime nothing to stop it keying straight back in. The retic runs again tomorrow, and the cycle restarts. That is the real problem worth solving.
Why it keeps happening
Bare surfaces give the minerals something to grip.
Raw stone is porous and glass is reactive at a microscopic level, so iron and lime key straight into both. Every drop that dries leaves its load behind. A coating changes what the water has to hold on to, so far less lands and what does land lifts instead of locking in.
On bare stone, iron soaks into the pore and stains
Raw limestone, concrete and paving drink the water in. The iron travels down into the pores, oxidises, and the stain locks in where no surface clean can reach it. Lime dries into the surface as scale in the same way.
On bare glass, scale bonds on and etches in
Hard water always carries minerals. On uncoated glass they land, bond to the reactive surface and, left cycle after cycle, slowly etch the glass for good. That is the road to a hazy window you can't clean.
A coating protects right at the surface
On stone, MineralProtect anchors into the mineral and pore structure, colourless and breathable, so iron and lime sheet off with far less dwell and what lands sits on top to be cleaned off. On glass, GlassProtect bonds a clear nano layer to the surface so minerals can no longer grip and wipe away instead of etching in. Both work where the wear and the cleaning actually happen.
The plain-English science of glass coating · why protection has to live at the surface
What to do next
Clean it back first. Then seal it.
The order matters. A coating protects a clean surface, it doesn't rescue a stained or etched one, so sealing over damage just locks it in. Get the surface back as clear as it'll go, then lock that in before the retic runs again.
- Stone that cleaned up, or new stone, gets MineralProtect so iron and lime sheet off and lift in cleaning instead of soaking in and staining.
- Glass that's still sound, or a new panel, gets GlassProtect so spotting wipes off instead of bonding on and etching in.
- Everything is registered under a 10-year guarantee, at $16/m² all-in, with a confirmed price before you book. We'll tell you straight what cleans up and what's past saving.
The honest limits
A coating is prevention, not a rescue.
We'll say it plainly, because plenty of sealers won't. A coating can't draw iron back out of stone it has already soaked deep into, and it can't undo glass that's already etched. Seal over either and you lock the damage in. Its whole job is to stop a sound surface reaching that point. And no coating makes anything stain-proof. Under constant bore or reticulation water with no upkeep, some marks can still form, on any surface on earth, because evaporating hard water always leaves minerals behind. The difference is what happens next: on a sealed surface those marks sit on top and wipe or rinse away, where on a bare surface they soak in, bond on and stain or etch for good. You are not buying stone and glass that never need a wipe. You are buying surfaces where a wipe is all it ever takes.
Bore water, answered
The questions people actually ask.
What causes the orange stains on my paving and limestone in Perth?
Iron in the bore water. Most Perth reticulation runs off a backyard bore, and that groundwater is loaded with dissolved iron. When it hits the air on your paving, wall or window it oxidises, the same reaction as rust, and leaves that orange to brown stain. Manganese in the same water can add darker brown or near-black marks. It builds worst where a sprinkler hits the same spot every cycle, so you often see a fan or a run line pointing back at the nearest head.
Will the orange bore-water stain come off my stone?
It depends on how long it's been there and how porous the stone is. Fresh iron staining sitting on the surface will often lift with a purpose-made rust and iron remover made for stone. Once the iron has soaked down into the pores of raw limestone or concrete and oxidised in there, it's bonded into the mineral and pore structure and is much harder, sometimes impossible, to draw back out fully. That's exactly why sealing before the staining starts is the move that matters.
Why does bore water spot and cloud my windows and glass pool fence?
Reticulation overspray lands on the glass and dries in the sun before anyone rinses it. Every drop that dries leaves its minerals behind, mostly lime and silica, and on glass those bond to the surface. Left cycle after cycle that scale builds, bonds on and eventually etches the glass itself, which is permanent. Perth's water gets glass there faster than soft-water places because it's so hard to begin with.
Does sealing stop bore-water staining completely?
No coating makes stone or glass stain-proof, and anyone who tells you otherwise isn't being straight. What a coating changes is where the iron and lime end up. On sealed stone the water beads and sheets off with far less dwell, and what lands sits on top and lifts in cleaning instead of soaking into the pore and locking in. On coated glass the minerals can no longer grip, so instead of bonding on and etching they wipe away. You get far fewer marks, and the marks you do get clean up, where on bare surfaces they set in for good.
I run my retic off scheme water, not a bore. Do I still get this?
Less iron staining, because scheme water carries far less iron, but you still get the hard-water side. Perth scheme water is still hard, so lime and silica still spot glass and leave white scale on stone and around pools. Bore water is the worst of both worlds, iron plus lime, but hard water alone is enough to haze glass and crust up a pool surround over time.
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Beat the bore water. Seal it once.
We'll assess your stone and glass, tell you straight what cleans up and what's past saving, and seal what's sound with the right coating for the material, registered under a 10-year guarantee. Far fewer marks, an easy wipe, and real protection where the retic keeps hitting. Confirmed price before you book.