Buy on Amazon : br br Hot Tub Spa Chemical Balance Pack: Alkalinity Up pH Increaser pH Decreaser Calcium Increaser br br Alkalinity Up Raises low total alkalinity TA to reduce corrosion prevent pH bounce 1 lb br pH Increaser Raises low pH to prevent corrosion optimize sanitizer effectiveness reduce eye irritation 1 lb br pH Decreaser Lowers high pH and TA to prevent scale buildup 15 lbs br Increase Calcium Raises low water hardness to prevent corrosion reduce foaming 14 oz br Only 1 more shipping for each additional chem pack STOCK UP SAVE