Seachem Alert Combo pH & Ammonia ( 1 Year) Seachem Alert Combo pH & Ammonia ( 1 Year) – The One Year Alert Combo pack combines a year supply of Ammonia Alert® (1 card) and pH Alert® (1 card and 1 replacement sensor). Ammonia Alert® and pH Alert® are almost half the size of competing products. At 1.5″ x 2.5″, they are small, clear, and unobtrusive, so they won’t detract from the view of your aquarium. Simply place Ammonia Alert® and pH Alert® visibly anywhere in the aquarium or filter. It’s that easy. Require no chemicals or test procedures For any further information or advice please feel free to message us on Facebook or contact the store on 01902 494860.