I wanted to follow up - I figured I would give these guys another try so I called the Pool shop again, to find out about getting the sand in our filter re-done & the owner said "you wrote a bad review about us on yelp so we won't work with you". I was actually surprised - rather than take the opportunity to earn my trust back they chose to lose out on potential business. My husband actually figured out how to change the sand himself - saving us a bunch of money.