Filling solution 3,5M for Swansensor pH SI+FL; 30ml Filling solution for Swansensor pH SI, Redox SI and Reference FL, 30ml. Specifications Electrolyte solution. Contact us to place an order. Downloads Downloads Click Here Related Products Regeneration solution for sodium electrodes OXYCON RC 1,413 Oxycon Carbonate Hardness Calibration solution pH4