envii Aquarium Klear - Natural Bacteria Clears Green Water Treatment, Crystal Clear Fish Tank Gravel Cleaner, Prevents Growth of New Algae - 500ml Treats 4,000 litres

Before choosing this product I had looked at plenty of others & thought they all say that they do this & do that. So I took a punt on this one, as they say the proof of the pudding etc (I do not recommend anybody trying to consume this product as it won't end well!) After a week, my aquarium always used to get a big build up of algae on the live plants, ornaments, air brick & filter as well as on the glass, which was due to its location & getting direct sunlight through 2 Velux windows (aquarium can't be moved elsewhere out of sunlight due to having limited space). I half emptied the aquarium l, cleaned plants etc but not the glass & refilled it & added 10ml as directed. After a week the results were astounding!! No return build up of algae on anything in the aquarium & after a 2 week of treatment, the algae has not returned! I thoroughly recommend this product! I am using 10ml weekly & it contains according to the labelling, natural ingredients that do not harm the fish, pondlife or plants. I'm so glad I took a punt as I was apprehensive that I would work & have found out it doe so amazingly well!

I have used many algae cleaning products for my tank that barely worked. So I saw this product and read the reviews was a little sceptical but purchased all the same. But wow I am amazed at how fast it worked I partially emptied my tank and added 7.5ml to refill water and wow was a little murky at first but now as you can see water is crystal clear and gravel is clean wow wow would highly recommend this product to anyone wanting fast acting aquarium cleaner pity can only give 5 +✨ ✨✨✨✨✨ great price, easy to use excellent performance

Yeah this has just what I was needing does what it says on the instructions pleased with this.

Great product works really well good value fish are in good health and removes all algae

As I read "Brandenvii Liquid volume 4000 Litres Item form Liquid" I believe I was buying 4000ml not 500ml. False information. That being said, I used 20ml in my 200+L tank and it cleared up within 2 hours, looks crystal clear. Been using interpet quick clear and it only made the water red.

I like this stuff. it is working much slower than expected by seller. you can see result in eight - ten weeks in my case, but it surely does a job. you can see that environment changes for better. snails are growing in numbers and running like speedy gonsales in animation. shrimps get a rich, deep colour. I became a big fun of envoi products and would like to recommend to try it to everyone interested in creating healthy environment for pond or fishtanks habitants.

Seems to be working nicely inside my fish tank. The algae that has developed on my rocks is disappearing. It is apparently completely safe for the fishes and also helps to keep the filter sponges cleaner too. Recommended to add to the water weekly.

I have used this for 2 months . The pond is a Lot clearer and I can clearly see the bottom of the pond and my prized Sterlet his visible . But , I have followed the instructions and cleaned the filter material twice a week . So whether it’s the medication the regular cleaning of the filter or a combination of the two I can’t say .

Hält was es verspricht, habe mehrere andere Marken gekauft aber das toppt keiner, deshalb kann ich es nur weiterempfehlen

Point négatif ? Franchement ? Aucun ! Le seul point négatif que j'ai lu avant de l'acheter était l'apparition d'un voile graisseux en surface, il faut savoir que ce voile se retire facilement mais surtout, il indique un bon travail des bactéries car ce sont elles qui provoquent ce voile. La qualité de l'eau est impeccable, il m'est arrivé par accident de verser trop de nourriture, l'eau est devenue jaune orange, et il était tard je me suis dit aïe gros problème là ! j'ai versé double dose de produit bactérien et me suis dit, je m'en occuperai demain après une bonne nuit de sommeil, le lendemain ? Incroyable, mon eau était nickel, toute transparente sans changement d'eau ! Ce produit est génial, note au vendeur, bon, ce n'est pas parce que je dis qu'il fonctionne super bien qu'il faut augmenter le prix hein ! Lol, j'ai racheté deux bidons, bon, c'est un peu cher mais il fonctionne super bien d'ailleurs je pense que je vais faire un abonnement pour toujours en avoir, j'espère que ça pourra aider votre choix, moi, j'achète ! Nous voici en 2025 et je n'ai rien changé, j'en commande toujours tellement il est parfait ! Regardez, photo côtés gauche et droit de mon aquarium...

Yo cuento mi experiencia: Tengo dos tortugas, que se han hecho ya bastante grandes. Cada una la tengo en un acuario (separadas, por que la mayor es bastante agresiva, la verdad). La cuestión es que en el acuario grande (80l) continuamente el agua turbia y cada par de semanas, totalmente verde. En la pequeña no me ocurría, no sé por qué. Tengo filtros, le he puesto carbón activado, etc, pero nada. Tras leer sobre el tema, vi que el problema eran algas. He probado un montón de productos de buena marca, que me han acabado saliendo carísimos, por que son botes muy pequeños y duran muy poco. Me valdría si hubieran dado algún resultado, pero para nada. Cada vez peor. Con este producto me ha pasado justo lo contrario: Utilicé 8ml para los sesenta y tantos litros de agua que tengo puestos. Al principio, parecía que nada, pero a los dos días, hasta mis hijos me decían que qué pasaba con el acuario que estaba muy limpio. El agua no es que esté clara transparente (las tortugas son muy sucias), pero esté sin un rastro de algas y bastante limpia. Estoy super contento. Ahora lo que hago es echarle producto una vez a la semana, pero super tranquilo por que calculando la cantidad de producto que viene y lo que le echo, me va a durar un montón. Os lo recomiendo si estáis con el mismo problema que tenía yo. Salu2.

Works well... I Like the dose-top!

I have purchased the stuff for 2 reasons. Made in England and sold by AMAZON. The long term use of the anti algae material will show that I have made the right choice but so far so good!