been using pure clean for a couple of years but im gonna change now because im fed up with it clogging the filter .
I find that when mixing powdered chemicals its always best to treat them a bit like when mixing gravy... i add the powder to boiling hot water in a mixing jug whilst whisking with a spoon or an old fork, this will help dissolve the powdered chemicals... works for me
i think something non powder now possiblyamtech fineline .
SPM should be mixed in warm water. If it is too hot most of the action will take place in a few seconds and it will not be as good as it should be. Its a phosphate