You can replace the system with an Express Water system.
Call Chuck 440-823-4273 he can do this for you.
But that said, I find it hard to believe what they told you. The only time I've ever seen a problem with the canisters is when someone tries to change the filters themselves and because they are very heavy when filled with water, the homeowner tends to drop them which damages the bottom. Another thing that doesn't make sense is you can buy these Big Blue canisters on Amazon for about $50 each but they are not the exact fit for the Nova system so not sure why they quoted you $400.
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