Your Pool Stains Don't Stand a Chance
Blackspot keeps coming back if you don't treat it properly. The proven twin-dose formula kills it at the root — apply, wait 7 days, apply again. No scrubbing. No guesswork.
Blackspot doesn't wash off. You need chemistry.
Those dark patches on the pool floor aren't dirt — they're algae with roots. Scrubbing makes it worse. One dose isn't enough. That's why pool pros treat it twice, seven days apart.
Twin-dose, 7 days apart.
Blackspot algae embed themselves into pool surfaces and release spores when water warms. A single dose kills the top layer but the roots survive. The twin-dose protocol cracks the problem in two clean passes.
Dose once
500g per 50,000 L at dusk. Brush visible spots, run the pump 24 hr.
Wait 7 days
Don't swim for 48 hr. Keep filtering. Stains will fade over the week.
Dose again
Final 500g cracks any remaining spores. Stays gone through summer.
Concrete numbers beat vague adjectives
Works in 24 hours
Visible results overnight on most stains.
50,000 L per kg
~$8 per treatment · two treatments per pack.
All pool types
Salt, chlorine, fibreglass, concrete, vinyl.
Aussie-made
Formulated for Australian pool chemistry.
4.9 / 5 · 370 reviews
Verified purchases from Australian pool owners.
Free shipping
Orders $149+ ship free from Sydney.
Remover 1kg
Black Spot Algae Remover 1 kg
- Kills blackspot at the root — proven twin-dose formula
- Treats up to 50,000 L per 1 kg pack · ~$8 per treatment
- Safe for salt, chlorine, fibreglass and concrete pools
- Works in 24 hours · apply, wait 7 days, apply again
Answers before you ask
Can I swim straight after dosing?
No — wait at least 48 hours with the pump running. Re-test chlorine and pH before swimming.
Why two doses?
Blackspot algae embed spores in the pool surface. A single dose kills the top layer; the second dose, 7 days later, wipes out what the first missed.
Will this work on a fibreglass pool?
Yes. Safe and effective on salt, chlorine, fibreglass, concrete, vinyl and tiled pools.
How many treatments in a 1 kg pack?
Two full treatments for a 50,000 L pool. Roughly $8 per treatment.
Treat now — or treat twice next spring
Autumn is the last clean window. Once the pool's closed, you can't see the stains growing beneath the cover.
Add to Cart