Wilma Users A question Guys.

We use a wilma 8 pot and it's working fine.
But what I would like to know is....
How often do you change the water?
Some say every week, some say just when they change from veg to flower.
What benefits are there to changing water more regularly?
Like I say we don't have any problems, good crop each time and I only change when I go from veg to flower and change half after pk week has passed.
All other times is just watching general feed levels and ph and keeping it topped up.
It's not broke so I'm not gonna fix it but I'd like your opinions

Uk btw
 
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