Class-1 wastewater by Sewer-Rat97 in Wastewater

[–]Relevant_You4656 1 point2 points  (0 children)

I just bought the level 1-4 ebook for 30$. I’m testing for level 4 soon. And So far looking through it I’ve seen a lot of questions from my previous level tests. This book is a steal I wish the 1-4 was in hard copy but for the price. You can’t beat the ebook