Sorry to hear about the leaking flow cells ! The cell is fragile - maximum permissible back pressure is just 20 bar. A couple of things must be done to avoid rupturing the flow cells - first and foremost be sure to use ONLY the correct waste tubing supplied in the accessories kit G1321-68755. Do Not substitute any waste line from another detector as these may cause excessive backpressure to the cell resulting in ruptures or leaks !
During Purging, Priming and Conditioning of the pump flow should be directed to waste only, not downstream through the sample path.
Hope this helps !