We bought it from a store because there were yellow stains in the toilet bowl and it removed them. Until now, nothing else we had tried worked. Here I found it at half the price compared to the stores so I will buy it again! It did the job for us, and in general this particular company is quite good with its products

It cleans grime easily and effectively but it doesn't do well with limescale. I recently moved and the toilet bowl in a spot where not enough water runs has built up limescale. (the bathroom is 20 years old) I have used 4 bottles so far, I put an absorbent cloth on the spot and leave it soaked for hours but the result is minimal...

Product of a Greek company which does what it promises as long as the instructions are followed correctly.
I had a serious issue with the toilet bowl as every few days something like slime would appear on the sides of the bottom despite thorough cleaning.
Since the competitor's product with over 200 good reviews was far from me and I always try, whenever possible, to have contact with physical stores, I went to buy plumbing supplies and told the seller about the issue, who recommended this product at the price of €6.80.
The process:
I emptied the bowl until it was completely empty. I let it dry well and then poured in enough of the product to cover the bottom. After 10 minutes, I filled the bowl up to the normal water level and let it act for half an hour. I flushed and did a quick cleaning with the brush.
If anything changes, there will be an update.

Very effective for its intended use, but also for any other surface where limescale (urine scale) has accumulated and it is not affected by caustic liquids.

I chose it because of the positive reviews and it turned out that... I did well. It was tested on two toilets with different problems. In the easier case, it simply cleaned everything with the direct use of half a bottle in the closed bowl with the liquid inside for 1 hour. In the other case, the basic plan was followed: old mop and removal of the existing water and use of 1 liter for 2-3 hours again with the lid closed. In both cases, the WCs were left open for ventilation, for days in the more difficult one which was uninhabitable and 2-3 hours in the other. The liquid is very strong, it has fumes and under no circumstances should it be used without a mask, gloves, and great caution.

It is excellent! It cleans everything, rust, salt, dirt. Try it on joints, it cleans without any rubbing.

I used it in five different toilets and it had very good results. It removed all the stains and salts. I used almost half a bottle in each toilet, where I poured it periodically, and in the end, I let it sit for at least 15-20 minutes and then scrubbed the entire inside of the toilet with a plastic brush. In case of rust, I noticed that you have to pour it multiple times on the stain and gradually it removes it. It is very strong, so be careful.

Carpet? I didn't like it at all and a drop fell on my hand and even though I rinsed it immediately, it burned me.... just awful