Continue shopping “AquaChek Pool Spa Total Dissolved Solids TDS Test Strips 561683” has been added to your cart. Product Price Quantity Total × Hayward Salt and Swim Vessel Nut GLX-DIY-VSLNUT $19.01 Hayward Salt and Swim Vessel Nut GLX-DIY-VSLNUT quantity $19.01 × AquaChek Pool Spa Total Dissolved Solids TDS Test Strips 561683 $12.01 AquaChek Pool Spa Total Dissolved Solids TDS Test Strips 561683 quantity $12.01 Cart totals Subtotal $31.02 Shipping Shipping costs will be calculated once you have provided your address. Total $31.02 Proceed to checkout — OR — Calculate shipping Country / region: Select a country / region… United States (US) State / County: City: Postcode / ZIP: Update