core/homeassistant/components/smarttub/icons.json

{
  "services": {
    "set_primary_filtration": {
      "service": "mdi:filter"
    },
    "set_secondary_filtration": {
      "service": "mdi:filter-multiple"
    },
    "snooze_reminder": {
      "service": "mdi:timer-pause"
    },
    "reset_reminder": {
      "service": "mdi:timer-sync"
    }
  }
}