Pops106

If it is just for testing then if you can test them individually you should be ok. So heaters without jets on then jets without heater on etc.

Are either of those threaded on the spa, they look completely different to mine but the same filter looks like mine.

The filters are appalling, we was going through 2 a week to start with. I found as soon as it started rattling because the pump couldn't get any water, put a new filter on, clean the old (2 days old) filter and make sure you leave it to dry. You can keep repeating this using 2 filters and maybe get 2 weeks out of 2 filters. What I have done now is cut one of the filters leaving only the bottom plastic part that screws into the hottub. I put a scrunchie scrub thing you use in the shower in the filter bag then the part of the filter that screws into the tub as a make shift filter. I then rinse the make shift filter out before and after use then every few days, works surprisingly well but it isn't likely great as a filter but at least I have a working hottub. Had the hottub 6 months, 4 months with DIY filter and still working well, we have it on 24x7.