I agree, but I'd spend half that..... either a 75 gpd or 100 gpd, she only has a 29g tank
https://www.amazon.com/dp/B00LKF3TCA/ref=twister_B075D85JVL?_encoding=UTF8&psc=1
I got the 150 because it wastes less water. Plus I'm making 75 gallon batches of saltwater and have a 20 gallon ATO reservoir.