Text: It is advisable to provide a preconditioned (deionized) feed water by using a Culligana, Continentala, or equivalent system in front of the MILLIPOREa System to extend the life of the MILLIPOREa cartridges (see Section 5, Facilities, Equipment, and Supplies).
Entailment: A Culligana, Continentala, or similar system can extend the life of MILLIPOREa cartridges.
Contradiction: It's impossible to use anything other than Culligana to extend the life of MILLIPOREa cartridges.