很奇怪不知道从什么时候开始就有了这些锈迹一样的东西
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估计是刮到游泳池里的金属材料 生锈了
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There are 3 reasons why you may see rust in your pool. It might be the start of Concrete Cancer.
1. A metal object like a bottle cap or hair pin has fallen into the pool and has been left sitting in the one spot and has started to rust. This type of rust spot is superficial and is only on the top layer of the pool surface. Most of the time this type of rust spot in pools can be treated by speciality pool chemicals like citric acid or complex stain removers available from most pool shops. Be sure to follow the directions carefully as some of these chemicals require you to lower your chlorine levels before adding the stain remover for maximum effectiveness.
2. The pool water has come into contact with the steel work from a crack or a gap in the concrete shell allowing treated water to come into contact with the steel reinforcing of the pool shell. Often you will first notice this type of rust issue as a small spot that gradually grows over time. You may of tried to remove the rust mark in the pool with pool chemicals as mentioned in point 1 above only to find the rust stain reappearing over time. With this type of rust stain it is far more important to get it repaired as soon as you discover it. Failing to do so can lead to concrete cancer which is when the steel reinforcing swells as it rusts and creates further cracks to appear in the concrete leading to more exposure to the pool water and more expense.
3. Rust Plating. This type of rust stain in pools occurs when there is too much metal in the water. Usually from heavy copper algaecide. Quiet often you will see this happen around outlet jets within the pool and most times in salt water pools. As the pool water passes through the filtration the water flows over the salt water chlorinator cell on is sent back to the pool as chlorinated water. As the water coming out of the jets is high in chlorine when going back to the pool if there is excess metals in the water the metals will plate out on hard surfaces looking like rust. This can be cleaned off with an acid wash and sometimes needs a straight acid mix to remove. It is recommended never to try and remove rust stains in pools with a straight acid mix unless you are very confident that you will not damage your pool surface. Better to leave this method to the professions.
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可能是下面的混凝土有裂缝了，导致钢筋锈蚀。建议早修复，否则会越来越严重，最后导致局部混凝土spalling ，那就废掉了。早修成本不多，无非就是要把水全部放了
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很专业了
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抄自一个修泳池公司的blog…
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先用钢刷刷掉然后再观察一下会不会又出现，如果反复出现那肯定就是哪里裂了
测一下水看看有没有金属超标
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水也会金属超标的吗= =
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现在修的话不是也要敲开露出钢筋才能修的吗～
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完了 这不会就是 混凝土 癌 吧 得尽早修啊
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是的，现在是小面积的修，等锈蚀严重了，变成贯通裂缝了，那就不是小修小补了。这就是concrete cancer.
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这是用了多少年的泳池啊？ 难道是马赛克泳池容易出问题？
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会的，金属超标会有metal staining
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