Pool algaecide stops algae growing in your pool. It does not replace chlorine: shock kills the algae that is already there, and algaecide helps clear it and keeps it from coming back. Used together, they are the fastest way to keep a pool clear in Indian heat.
Quick answer: with Algo Pro, add 1 kg to a 50,000 litre pool as a first dose, then 250 g every 3 to 5 days in hot weather (from the product label). For other sizes, use the pool dose calculator.
Shop pool algaecide: Algo Pro, a chlorine-free algaecide in 1 litre to 200 litre packs.
View productAlgaecide or shock: which do you need?
| Situation | Use |
|---|---|
| Water already green or cloudy | Shock first (Hypo Pool Shock or Chloro Maxx 90 tablets), then algaecide |
| Clear water, hot weather or heavy use | Algaecide every 3 to 5 days to prevent algae |
| Black spots on walls or steps | Brush hard, shock, then algaecide |
Types of algae
- Green algae: the most common; turns the water green or leaves green patches.
- Mustard (yellow) algae: yellow-brown dust in shady corners that brushes off but returns.
- Black algae: dark spots that cling to rough plaster and grout.
- Blue-green algae: slimy growth that can make water look teal.
Algo Pro treats all four.
How to use pool algaecide
- Test the water and bring pH to 7.2 to 7.6.
- If the water is green, shock it first. See green pool water: how to fix it.
- Brush the walls, steps and floor so the algaecide can reach the algae.
- Add the Algo Pro dose around the pool with the pump running.
- Run the filter, and repeat the maintenance dose every 3 to 5 days in hot weather.
Tips to stop algae coming back
- Keep chlorine between 1 and 3 ppm, or keep up your Pool Maxx 35 dose.
- Run the pump long enough each day and keep the filter clean.
- Shock after heavy rain or a busy weekend.
- Brush corners and steps every week; algae starts where water does not move.
More pool care guides
Frequently asked questions
What is the difference between algaecide and shock?
Shock is a large chlorine dose that kills algae and bacteria quickly. Algaecide works alongside it, helping clear algae and stopping it coming back between shocks.
How much algaecide should I add?
With Algo Pro, the first dose for a 50,000 litre pool is 1 kg, then 250 g every 3 to 5 days in hot weather, from the product label.
Does Algo Pro contain chlorine?
No. It is a chlorine-free algaecide, so it can be used in chlorine pools and in pools treated with Pool Maxx 35.
Which algae does it treat?
Green, black, blue-green and mustard algae in pools, spas, hot tubs and surrounding surfaces.
