See the chart below describing the differences between the 316 plates and 304/321 plates.
| 316 vs 304/321 | ||
| 316 | 304/321 | |
| Cost | $70 | $95 |
| Avg # of sessions per set* | 30-40 | 30-40 |
| Avg cost per session | $2.00 | $2.71 |
| Recommended session length | 30 min | 20 min |
| Recommended for | Home | Office |
| Overall session result | Same | Same |
*Because of varying water qualities, there is no guarantee on the number of sessions per set plates you will receive.
