GroLine Electrode Storage Solution (500 mL) HI70300 50 chlorine filter Pro tip: Pair the SE220 lead free glass bottle Pro tip: Pair the SE220 with Milwaukee pH buffer solutions and KCl storage solution for a complete probe maintenance kit — maximizing accuracy and probe longevity Milwaukee MI512 100 Low Range Phosphate Reagent Kit – 100 Tests Placing the electrode in a small glass filled with storage solution or replacing the solution in the protective cap is a suitable way to store the electrode The GroLine storage solution is specifically formulated to minimize microbial growth and to prevent any diffusion osmotic effects from storing a probe in a solution with the highly concentrated inner reference electrolyte