| 21. | Some substrates are used to alter water chemistry.
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| 22. | When the water chemistry changes, the slime layer breaks down, allowing disease-causing bacteria to get in.
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| 23. | A knowledge-based approach for classifying lake water chemistry.
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| 24. | In its habitat, the natural water chemistry has a pH of 6 to 6.9, slightly acidic.
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| 25. | Impounded waters also experience changes in water chemistry, which could affect survival or reproduction of riverine snails.
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| 26. | It is recommended to copy the local water chemistry if keeping fishes from the great African lakes.
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| 27. | Education about waste treatment requires course work in systems design, machinery design principles, water chemistry, and similar coursework.
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| 28. | Two-thirds of the building serves as a support system, with engineers controlling pumps, filters, currents and water chemistry.
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| 29. | Testing leads to the part of pool preparation and maintenance that is most perplexing to homeowners _ pool-water chemistry.
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| 30. | Water chemistry is not especially important and temperature in the 72 79 �C ) range is fully sufficient.
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