Water Shield

Water Shield is a Nature-based shaman buff. The spell improves mana regeneration, and when taking damage, it restores mana to the caster. Water Shield can only proc every few seconds and has three charges.

Improvements
Improved Shields increases the mana returned from each orb by 15%.

Improved Water Shield causes an orb to be consumed each time the caster gets a critical effect with Healing Wave, Lesser Healing Wave, or Riptide.

Glyph of Water Mastery will increase its passive mana regeneration by 30%.

Glyph of Water Shield will increase the number of charges by 1.

Tips and tactics
Since cost no mana and provides a passive bonus, Water Shield should be up whenever you aren't using Lightning Shield or Earth Shield on yourself. It is a good practice for Elemental and Restoration shamans to make sure Water Shield is always active.

It is generally a good idea to refresh Water Shield often, it costs no mana and you might not have time to recast it later. An experienced player can usually ensure that the buff is up 100% of the time.

If possible, always refresh Water Shield before the last charge is used up. If all three charges are consumed, you will lose the passive mana regeneration until you recast it.