Filling solution 3,5M for Swansensor pH SI+FL; 500ml Filling solution for Swansensor pH SI, Redox SI and Reference FL, 500ml. Specifications Electrolyte solution. Contact us to place an order. Downloads Downloads Click Here Related Products Reagent set Oxycon Online Phosphate Calibration solution pH9 1000ml Oxycon Chlor (Start, DPD 1a & 1b, 2, each 1x 45ml) Redox buffer 475mV, 40ml