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Hey Freddie I've noticed the newer tube assembly has a different appearance (more opaque) so I'm hoping the plastic is more resistant to the higher pH. I haven't had a chance to try it out yet but fingers crossed.I contacted Red Sea for their ReefDose for the same thing, before trying to kalk dose. They said that kalk is rated at about a ph of 12, but their inner pump tubing is rated at about a ph of 10.
Red Sea’s inner pump tubing would not hold up for the long haul.
That could be the case with Versa’s inner tubing holding up to kalk as well.
@drawman
Was a versa pump with kalk, your issue as well?
Freddie