Petco Text Logo
Petco Pet Logo

Is distilled water safe for my fish tank if I lack conditioner?

Updated On September 23rd, 2025

Pet's info: Fish | Unknown - Fish | Male | unneutered

Hello. I don't have water conditioner yet for my fish tank but may I add distilled water to the tank in the meantime?

1 Answer

Most Helpful Answer

Image profile

Answered By Lauren Barry, BVSc, MRCVS, DVM

Veterinarian

Published on June 5th, 2017

Hi I don't recommend using distilled water in your tank as the "osmolarity" of the water can cause problems for your fish. Either pick up a bottle of water conditioner from a pet store or draw a large bucket of tap water and let it sit for 4 or 5 days. Some of the chemicals will evaporate out when left to sit, but it's not such an ideal option.

Vote icon

2Pet Parents found this answer helpful

image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Sponsored