The standard filter, at least on mine dating from 2005 had a grey or black body. It was impossible to tell whether the filter was blocked or not, The automotive ones with the pleated filter element and clear plastic body make it easy to see if they are starting to get blocked. They are also very cheap, the equivalent of a couple of dollars at most even in the UK ! ( I didn't price up a VP one, I'm sure it would not have been cheaper !).
I've never done anything with the Neutrasalt system for winterizing; it's isolated from the engine when the solenoid valve is closed. However, I do keep the engine compartment at around 4- 5 deg. C though, using tube heaters and a thermostat.
I imagine the solution can freeze, I don't know at what temperature that happens. I can't see it damaging the solenoid valve or hoses as there's so little volume of solution in there, the filter maybe. The reservoir is vented but presumable if it's very full and freezes a lot of pressure could develop and split it. If in doubt, drain it out !
You can drain. back fill with antifreeze as normal, the solenoid valve will stop any back flow into the Neutrasalt reservoir.
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