ARKA Special Blend - 8oz / 236 ml - Living bacteria for water purification, breaks down organic waste & nitrate, for freshwater and saltwater aquariums, 100% biological

Not used as yet, but this looks like a great product, I am sure I will get good results.

First of all, it stinks, badly. But seems to be doing great job. Used together with Nite Out II and my ammonia dropped to 0ppm within 12 hours, so the nitrites. Water is clear, and I've noticed the brown algae has reduced a bit too. I am very pleased with the product, a must-buy for fresh aquariums.

Great stuff , does what it says , strong smell but disappears in a few minutes

Omg the smell it is so sulphur its unreal even with lid closed wrapped in 2 bags I could smell it stunk the whole house out had to put it and 2 bags in a sealed bucket lol

We struggled with very high level of Nitrate and Nitrite in our new fish tank, 25% water changing weekly did not help so we were looking to find a solution to address this problem, after searching the internet we found this produce and we decided to give it a try, after 2 applications, both Nitrate and Nitrite reading has come down to normal/safe level. We are very happy with this stage of our tank environment, we highly recommend this product to everyone who has same issue in fish tank as us. Great product!

Good value for the money

I have purchased this brand and products for years. However, the last one I purchased had the most repugnant smell. Normally it does have a odour but I literally had to put box in a sealed bag and leave in the garden till returned. One off bad patch or the recipe has changed

Doing briliant job!