I haven't heard of that product before. I heard of the additive but don't know if it works.
How old is your cat? How many other cats do you have and how many litter boxes do you have? Have you eliminated the possiblity of illness?
There's a nice rule of thumb when it comes to litter boxes. You should have 2 boxes for every 1 cat AND/OR 1 litter boxer for each level of your house +1.
If you have more than one cat, it could be a territory thing or you don't have enough litter boxes. Even if you only have 1 cat and 1 litter box, sometimes just getting another one helps for some reason. Also, if there's a stray cat outside, sometime a cat will feel threated and pee outside the box even though the other cat has never been inthe house. Sometimes the type of litter you use can make cats not want to use it. Some cats don't like scented litters or a certain texture of litter. I had a cat once, never had a problem with using the litter box then all of a sudden she decided she didn't like the litter anymore and stopped using it. We switched litter and had no more problems.
Also if you haven't eliminated the chance of it being sick, that could be another factor.
I know this doesn't answer your question but its always good to make sure you cover all your bases just in case. If it is just a thing of you not having enough litter boxes, than I'm sure it will be cheaper buying another box than the attract litter or the additive. On the other hand, if you get this attract litter or the additive and the real reason is that it is sick, then you won't be solving the issue at all and whatever illness your cat may have could just get worse and worse without treatment