- The test that tells you when it's time to shock. 2-way test strip for Total & Free Chlorine.
Details: ShockChek is the fast, easy way to determine if you need to shock (or super chlorinate) your pool or spa. Just dip a strip and compare to color chart which indicates a simple “Shock” or “Okay” result. Shocking is a necessary maintenance step that keeps the water clear of harmful contaminants that can cause irritation and spread water-borne illnesses. For use with the free AquaChek Smart app available on iTunes and Google Play.