If you’re reading this right now, then you’re probably having problems with high levels of cyanuric acid rendering your pool chlorine ineffective, that or you’re just naturally curious if it’s possible to chlorinate your pool without using cyanuric acid for protection.
The simple answer to that is, well, there is no simple answer to that. If you have an indoor pool or a spa that isn’t exposed to sunlight, then yes, you can get away with not using any cyanuric acid or stabiliser. But if you have the pool in a location exposed to sunlight then you have to use cyanuric acid to protect your chlorine so that it can survive under the sun long enough to do its job. No matter what anyone says, you will need cyanuric acid for your pool, unless of course you want to stand there poolside with a shovel dumping chlorine into your pool every hour and you have unlimited funds to burn on purchasing chlorine.
Why is it needed? If you love science, you can check out this paper here available on the QCAA and read up on the specific effects of sunlight on swimming pool chlorine in an unstabilised state. But if you’re not the sciencey type, then here’s the TLDR (Too long didn’t read) version: Without cyanuric acid, you’ll be losing half of your free chlorine under 20 minutes! (17 if you want to be precise).