Fit a pump dispenser to the container and then there is even less chance of it splashing it also gives correct measures so less wastewearing eye protection in my opinion is over the top.

You could say the same for washing up liquid.

Hi

I found a guidnce sheet from the HSE on this very topic.

http://coshh-tool.hse.gov.uk/assets/live/SR02.pdf 

They suggest using goggles if using acids or caustics. 

However, PPE could be considered unnecessary if you have other control measures in place. And lets be honest, who will wear eye protection everytime to put chemical in a bucket. 

A pump would be a good idea as this would also minimise skin contact with the chemical.

Also consider substituting it for a safer product. 

Adding the correct amount of chemical in a controlled manner to the water and not the other way around will also further prevent splash back. It would also instantly dilute the chemical further reducing the effect on the eyes.

Training, instruction and supervision.

Ensure there an eye wash station or eye wash available in a first-aid kit.

Hope this helps