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I bought a box of Chlorox Shock Plus, active ingredient Sodium dichlor (like this: Clorox Pool and Spa Shock Plus, 12-Pack - Walmart.com) And I just finished using it for my pool opening which was battling massive algae, when I looked at the box and it said: "Not for use as a sanitizer or...

Hi, I am trying to get an Hayward H400 natural gas pool heater back into operation. So far I have replaced the control and ignitor circuit boards, and it is now showing IO, Ignitor Open error code when I turn it on. This is what happens: 1. I turn on the heater and bump the thermostat up high...

Hi, I am new to the forum, but an avid reader of the pool school pages. I just became the Chief Pool Officer of an inground gunite pool, about 18,000 gallons in our new house on the outskirts of Boston. The previous owners didn't do much to maintain (the pool or the house for that matter), so...

Hello, I am opening an in-ground pool at our new house for the first time, and the chemicals are going well, but no swim time has happened yet as I'm waiting on CYA to dissolve to start shocking. The pool is gunite, approximately kidney bean shaped, and appears to be 30-40 years old. The deck...