BLACK OUT 1L WATERWELL
You've probably seen black algae and thought it was a stain. It's not. It's a living organism that roots itself into the porous surface of your plaster or marbelite, forms a waxy protective outer layer that standard chlorine cannot penetrate, and grows back within days of surface treatment. Every po
R311,54
It actually kills the organism instead of temporarily bleaching it. Black algae's waxy cell wall makes it one of the most chlorine-resistant organisms in a pool environment. BLACK OUT's formulation disrupts that protective barrier and delivers active compound to the organism beneath — the difference between treating the problem and just lightening its colour temporarily.
You stop the permanent surface staining before it sets. Black algae left untreated will permanently discolour marbelite and plaster surfaces — requiring acid washing or, in severe cases, resurfacing at significant cost. The window for clean treatment is now, before the staining becomes structural. BLACK OUT applied at first sighting closes that window in your favour.
Visible progress within 24–48 hours. The black spots begin lightening as the active compound works through the organism. You see evidence that the treatment is working — not a five-day wait with no visible change before you know if it worked.
Works alongside your regular chlorine programme. No system reset required, no extended pool closure. Apply BLACK OUT as a targeted treatment within your existing maintenance routine — your weekly chlorine programme continues normally.
You've probably seen black algae and thought it was a stain. It's not. It's a living organism that roots itself into the porous surface of your plaster or marbelite, forms a waxy protective outer layer that standard chlorine cannot penetrate, and grows back within days of surface treatment. Every pool owner who tries to bleach black algae with extra chlorine learns this the hard way. BLACK OUT is what actually works. Black algae that's caught early is a one-bottle problem. Black algae that's left for a season can be a resurfacing problem. Treat it now.
Product Type: Black Algae Killer / Algaecide
Active Ingredient: Copper-based quat algaecide compound
Target Algae: Black algae, mustard algae, green algae
Form: Liquid concentrate
Dosage (treatment): ±100 ml per 10,000 L for active algae
Dosage (prevention): ±25 ml per 10,000 L per 2 weeks
pH Range for Use: 7.2 – 7.8
Application: Brush affected areas first; broadcast directly into pool
Brush Requirement: Vigorous brushing of affected surfaces required before and after dosing
Wait Time to Swim: 1 hour after application
Brand: WaterWell
Size: 1 L
Compatible Pool Types: Marbelite, plaster, pebble — test on fibreglass first
Delivery Available or Click & Collect