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31. Without oxygen Biological filtration ceases leading to increase in Ammonia/Nitrite levels.

32. Ammonia is the toxic waste produced by the fish and this is initially bacterially broken down to nitrite in your filtration system.

33. The fractional excretion of magnesium rises as glomerular filtration rate falls.

34. Changes can be reduced by good filtration, which will remove ammonia and nitrite, and even nitrate.

35. The tank is three feet long and has both undergravel and internal power filtration.

36. A fish that comes from slow-moving often murky waters is unlikely to appreciate bright lighting or turbulent filtration.

37. Pre-filter media All pre-filter media listed here will support some bacterial filtration.

38. No shells I have a four foot Tanganyikan tank with undergravel filtration through coral sand and limestone as decoration.

39. Aquarium filtration systems based on organic filters also have problems because toxins build up in the water, Fahs said.

40. Use of Ammonia, Nitrite and Nitrate test-kits will give you an accurate measure of how effective your bacterial filtration is.

41. The rock mixture is 80% tufa rock and 20 percent living rock. Undergravel filtration is powered by two Aquaclear 402 powerheads.

42. Your first question should be: Why is filtration necessary in the fish tank?

43. Even when an expensive filtration plant was finally installed it proved inadequate.

44. Not only can it be introduced by contaminated water changes but it is also self-generated as part of the biological filtration cycle.

45. Something about a reverse osmosis filtration system[sentencedict .com], which is too tricky to explain now.

46. Urine is processed separately through a more stringent filtration process than the waste water.

47. New developments in filtration have been mainly in the direction of improving performance and lengthening the times between backwashing.

48. Interference can be avoided by the precipitation of zinc sulphide and filtration.

49. Foam media is also supplied in some units as the main source of biological filtration.

50. For chemical filtration, which usually means packing with an absorptive medium such as activated carbon or some sort of resin.

51. It may be just a surface for bacteria or may play a more active part in filtration.

52. An under-layer of cheaper gravel can provide the depth required for terracing, planting, or undergravel filtration.

53. Reactions are carried out at high pressure and temperature and the processes involve large scale filtration, drying, milling and packing.

54. I prefer reverse-flow undergravel filtration and an Eheim 2215 would suit your purposes quite well.

55. The filter system is powered by an Eheim power filter for mechanical filtration, surface turbulence and supplying the trickle filter.

56. Both these types of contaminant must be removed by flocculation and filtration.

57. Filtration in both tanks is undergravel(Sentencedict.com), driven by powerheads and both contain protein skimmers.

58. A degree of anaerobic filtration should take place in this media.

59. To save time in this case, filtration used, in combination with settling is the best answer.

60. This caution can not be overstated in light of the decreased glomerular filtration often present in chronic liver failure.