I use
Nortembio Organic Anhydrous Citric Acid 5.2 Kg. Food Grade, 100% Pure. Acidulant and Preservative for Cooking and Confectionery. Special for Lemonade and Jams. Recipes E-Book Included. https://amzn.eu/d/2YROUBH
Yeah I’m gonna the milliard stuff for the next time I’m doing a big clean of all equipment and that’s all I can find it says 100% citric acid it should be fine I hope lol