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shadowgraph    
n. 将影子投射影幕上的技术,皮影戏,放射线透视照相

将影子投射影幕上的技术,皮影戏,放射线透视照相


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  • Home - Trouble Free Pool | Trouble Free Pool
    With over 400,000 members, TFP is the largest and most influential pool spa website on the Internet The reason is simple: TFPC (Trouble Free Pool Care) is a methodology, not a product that you must purchase It is being practiced by thousands of pool owners just like you We are a registered 501(c)3 non-profit that is funded by user donations
  • PoolMath - Trouble Free Pool
    Discover the pool calculator behind the perfect pool, PoolMath Dealing with pools has allowed TFP to become the original authors of the best calculator on the net To help you better understand the calculator and keep your water clean and clear, you should also view the following: ABC's of Pool Water Chemistry
  • Managing pH and Total Alkalinity - Trouble Free Pool
    The Alkalinity of pool water is lowered using Acid Adding Muriatic acid is the best way to reduce your TA because alternative acids add other chemicals to your pool or negatively impact you or your pool Dry acid should not be used in plaster pools or pools with a SWG Adding acid lowers your TA, but it also lowers your pH
  • Electrical Bonding - Further Reading - Trouble Free Pool
    Pool water if none of the bonded parts are in direct connection with the pool water Note that 2023 NEC 680 26(B)(6)(b) refers to pool water heaters rated at more than 50 amperes, that some Heat Pumps qualify as, and having specific instructions regarding bonding and grounding, only those parts designated to be bonded shall be bonded and only
  • Pool School - Trouble Free Pool
    With over 400,000 members, TFP is the largest and most influential pool spa website on the Internet The reason is simple: TFPC (Trouble Free Pool Care) is a methodology, not a product that you must purchase It is being practiced by thousands of pool owners just like you We are a registered 501(c)3 non-profit that is funded by user donations
  • PoolMath - Trouble Free Pool
    With over 400,000 members, TFP is the largest and most influential pool spa website on the Internet The reason is simple: TFPC (Trouble Free Pool Care) is a methodology, not a product that you must purchase It is being practiced by thousands of pool owners just like you We are a registered 501(c)3 non-profit that is funded by user donations
  • Opening your pool- An easy to follow guide - Trouble Free Pool
    Using the Pool Math program, determine the correct amounts of chlorine, CYA, acid or other chemicals needed and dose as instructed You can find more details on proper chemistry levels for your pool in our ABC’s of Pool Water Guide Lastly, many pool owners may open to green water and will need to “SLAM” the pool This involves adding
  • CYA Chlorine Relationship - Further Reading - Trouble Free Pool
    In fact, a pool with a 2 5:1 CYA:FC concentration has only 1 5th the active chlorine (HOCl) compared to a pool within the CDC's guidance for safe and ideal levels So a pool at SLAM level has only 1 5th the active chlorine (HOCl) as a pool that is within CDC guidance for safe and ideal More chlorine can be less harsh, one of the most difficult
  • Mustard Algae - Trouble Free Pool
    With over 400,000 members, TFP is the largest and most influential pool spa website on the Internet The reason is simple: TFPC (Trouble Free Pool Care) is a methodology, not a product that you must purchase It is being practiced by thousands of pool owners just like you We are a registered 501(c)3 non-profit that is funded by user donations
  • PoolMath Frequently Asked Questions - Trouble Free Pool
    With over 400,000 members, TFP is the largest and most influential pool spa website on the Internet The reason is simple: TFPC (Trouble Free Pool Care) is a methodology, not a product that you must purchase It is being practiced by thousands of pool owners just like you We are a registered 501(c)3 non-profit that is funded by user donations





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