I have never used them . I have used kalk and currently have a new CaRx . Unfortuntly I have to downsize to a 90 . I order to fit my skimmer I have now I will need to use a 36 in sump then ato there is no room for it so dosing pump it is although I could fit a kalk stirrer in there , I have an apex , so what would be the recommend dosing pump that you have had good succes with.


