How often should I add Steinbach Algezid to my pool?

For regular maintenance, a weekly addition of 20 to 40 ml per 10 m³ of water is recommended. In cases of heavy algae growth or after adverse weather conditions, the amount can be increased to up to 600 ml per 10 m³.

Does the product foam when added to the pool water?

No. The algaecide is explicitly formulated to be foam-free. It produces no disruptive foam on the water surface, during swimming, or during pump operation.

Does the algaecide work against existing algae growth?

Yes. When visible algae are present, the dosage can be significantly increased. The product works both preventively and against established algae growth.

Do I still need flocculants when using the algaecide?

Not necessarily. The algaecide also helps remove turbidity from the water, so the pool often becomes clear without additional flocculants. For very cloudy water, combining both treatments may still be beneficial.

Is the product suitable for above-ground pools?

Yes, the algaecide works for both above-ground and built-in pools. It can even be applied undiluted to pre-treat pool walls – particularly useful before the very first fill.

How long does the 5-liter bottle last?

This depends on pool size and usage intensity. For a small 10 m³ pool at the minimum weekly dose, the bottle can last multiple seasons. For larger pools or more intensive treatment, plan for roughly one full swimming season.

How do I apply the algaecide as a pool wall pre-treatment?

Apply the undiluted product with a sponge to the dry or slightly damp pool walls before filling. This creates a protective base layer that makes it harder for algae to adhere right from the start.

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Pool Care

Steinbach Liquid Algaecide 5 L

Name: Steinbach Poolpflege Algezid flüssig - 0753505TV00-5 l - Schaumfrei & hochkonzentriert - Verhindert Algenwachstum & entfernt Trübstoffe - Für klares Wasser mit Langzeitwirkung
SKU: B01HRYA7D6
Rating: 4.6 (3520 reviews)

Steinbach Poolpflege Algezid flüssig - 0753505TV00-5 l - Schaumfrei & hochkonzentriert - Verhindert Algenwachstum & entfernt Trübstoffe - Für klares Wasser mit Langzeitwirkung

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#8 in Pool Care

4.63,520 reviews

Verified June 2026

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Verhindert zuverlässig Algenwachstum - Das hochkonzentrierte Algezid schützt dein Poolwasser effektiv vor grünem Belag und Algen - für dauerhaft sauberes und gepflegtes Wasser.
Klares Wasser - Neben der Algenverhütung hilft das Mittel auch dabei, Trübstoffe im Wasser zu entfernen. So wird das Becken sichtbar klarer - auch ohne zusätzliche Flockungsmittel.
Schaumfrei & hochkonzentriert - Das Algezid ist schaumfrei. Die hohe Konzentration sorgt für eine langanhaltende Wirkung - bereits bei geringer Dosierung.
Dosierbar für Alltag & Problemfälle - Für die regelmäßige Pflege reichen 20–40 ml pro 10 m³ - bei starker Belastung durch Wetter oder Algenbefall können bis zu 600 ml pro 10 m³ eingesetzt werden.
Auch zur Vorbehandlung der Beckenwand geeignet - Zur Algen-Prävention kann das Produkt unverdünnt mit einem Schwamm aufgetragen werden - besonders vor dem Befüllen von Aufstell- oder Einbaubecken.

In detail

Anyone who owns a pool knows the feeling: you check in after a hot summer weekend, and instead of that crystal-clear blue you were hoping for, you spot the first greenish streaks along the pool wall. Algae. The invisible enemy of every pool owner, capable of spreading faster than you'd expect and putting a premature end to a perfectly good swimming season. Steinbach's liquid Algezid is a highly concentrated algaecide for pools of all types. It reliably prevents algae from taking hold in your pool water – keeping your personal oasis exactly that: an oasis. The foam-free formula is a genuine quality feature, meaning no unpleasant foam on the water surface, no disruption while swimming, and no foaming during pump operation. What's particularly convincing about this product is its flexible dosing. For regular maintenance, 20 to 40 ml per 10 cubic meters of water is all it takes to keep algae growth at bay. When things get more serious – after heavy rain, periods of heavy swimming use, or at the first visible signs of algae – the dose can be increased to up to 600 ml per 10 m³. One product for all situations, rather than a shelf of different specialty treatments. Especially practical: the Algezid can also be applied undiluted to pre-treat pool walls before filling. Particularly when setting up an above-ground or built-in pool for the first time, treating the walls with a sponge beforehand creates a protective base from the very start – making ongoing maintenance easier going forward. Another strong point: the product doesn't just fight algae. It also helps remove turbidity from the water, leaving your pool visibly clearer without the need for additional flocculants. The highly concentrated formula means even small amounts deliver long-lasting results, making the 5-liter bottle an economical choice for the entire swimming season. With over 3,500 reviews and consistently strong feedback from the pool community, Steinbach's Algezid has established itself as a dependable companion from the first fill-up of the season all the way through to winterization.

Pros & cons

What speaks for it

Foam-free formula – no foaming on the water surface or during swimming
Flexible dosing for routine care and problem situations (20–600 ml per 10 m³)
Removes turbidity – clear water without additional flocculants
Suitable for pre-treating pool walls before the first fill
Highly concentrated – long-lasting effect even at low dosage

What to consider

5-liter container may be oversized for very small above-ground pools
Regular application required – a single dose does not replace ongoing maintenance

Frequently asked

All questions answered?

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Use cases

Weekly routine pool maintenance to prevent algae growth throughout the entire swimming season
Intensive treatment for early-stage algae growth after heavy rain or high swimmer load
Pre-treatment of pool walls when filling a new above-ground or built-in pool for the first time