https://www.amazon.com/dp/B007RGAL6I/ref=cm_sw_r_cp_apa_glt_fabc_FANXRCTDHTJM004VVDVE
I took these and mixed them with the water I was using to water my plants. Like take a tablespoon or two and toss it in and stir it around. For good measure also take some of the pieces and sprinkle it on top of the soil
Yep, bad scale. Coffee grounds also "help" but don't cure. Mine are outside, so I just dump the grounds on the apex and it deters the scales from the new flush, but won't eliminate an infestation in the roots. You need chemicals for that. Unfortunately the effective ones cost $$$