What is ph level of this product?

I do not know. But the product is strong. Will take the skin off your face. Even at 30%.

Anyone use this for crows feet or under eye?

I do. There is always someone out there agowing their 1990s skincare education saying never put acid there. That is probably true if you are sensitive everywhere or suffer from peel complicationslike hyperpigmentation but I use it under my eyes. That said it’s more for oil control/acne than to remove wrinkles.

How often should i use this if I'm using it as an all-over facial peel? Also, will this help make my pores smaller?

This is a bha which will help you exfoliate your skin. It penetrates into your pores to help eliminate comedones and it heals and dries blemishes. You can also use it as a spot treatment... if you are planning to use it all over your face, since it’s a peel and this concentration is a bit strong I would say a medium ( and more if it’s your first time, because your skin is not used to it) you can do it every 3 months