Precision Hydration electrolyte drink mix packets contain no artificial ingredients and come in three strengths so you can match your sodium intake to how you sweat. Each pack has 8 serves; dissolve one packet in 500ml of water.Choose your strength PH 500: moderate strength, for lighter sweaters, cooler conditions and shorter sessions PH 1000: strong, the all-rounder for moderate to heavy sweaters and warmer conditions PH 1500: very strong, for heavy or salty sweaters, hot and humid events, and starting hydrated before big days When to use it Hot-weather training, long runs and rides where you lose a lot of sodium in sweat The day before and morning of a key event, to start well hydrated During sessions where you're getting carbohydrate from gels or chews and need electrolytes separately Not sure which strength?Precision offers a free online sweat test and personalised hydration plan at precisionhydration.com. As a rough guide, the heavier or saltier your sweat (white salt marks on kit, stinging eyes, cramping), the higher the strength you're likely to need.Good to knowPackets suit people who want a bigger batch of electrolyte drink, while tablets and capsules are easier to carry on the move.