Hose: Day 1, ~1 PM - PowerPoint PPT Presentation

Depicted on the following slides are water samples taken from scuba diving rinse tanks at a dive fac...
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Depicted on the following slides are water samples taken from scuba diving rinse tanks at a dive facility on Bonaire, Netherlands Antilles October, 2007, for 3 days.

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Hose: Day 1, ~1 PM

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  • Depicted on the following slides are water samples taken from scuba diving rinse tanks at a dive facility on Bonaire, Netherlands Antilles October, 2007, for 3 days.

  • Equipment rinse tank “A” was drained, cleaned with bleach and rinsed each morning, before filling with water and sampling (~8:00 AM)

  • Equipment rinse tank “B” was drained and rinsed each morning, before filling with water and sampling (~8:00 AM)

  • Water samples were taken from both equipment rinse tanks at ~1:00 PM and ~5:00 PM

  • Water samples were taken from a regulator rinse tank daily at ~8:00 AM, ~1:00 PM and ~5:00 PM, but we did not know when this tank was drained and refilled (by dive facility personnel and other divers)

  • Water samples were taken daily from the hose used to fill all rinse tanks

  • On two days water samples were taken from buckets on dive boats used to rinse/store masks

  • 0.25 ml of each water sample was spread on Terrific broth-agar plates; plates were incubated at 37oC overnight and photographed


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On all days, water samples from the hose (throughout the day) and from equipment rinse tanks “A” and “B” at ~8:00 AM, after draining, cleaning with bleach (“A”) or not cleaning with bleach (“B”), rinsing and refilling did not produce any bacterial colonies. Representative plates are shown below.

Hose: Day 1, ~1 PM

Hose: Day 2, ~8 AM

Hose: Day 3, ~8 AM

Tank “B”: Day 1, ~8 AM

Tank “A”: Day 3, ~8 AM


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Day 1

Regulator tank: ~5 PM had no colonies

(not shown)

Regulator tank: ~8 AM

Regulator tank: ~1 PM

Tank “B”: ~5 PM

Tank “B”: ~1 PM

Tank “A”: ~1 PM

Tank “A”: ~5 PM


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Day 2

Regulator tank: ~8 AM

Regulator tank: ~5 PM

Regulator tank: ~1 PM

Tank “B”: ~5 PM

Tank “A”: ~5 PM

Tank “A”: ~1 PM

Tank “B”: ~1 PM


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Day 3

Regulator tank: ~8 AM

Regulator tank: ~1 PM

Regulator tank: ~5 PM

Tank “B”: ~5 PM was empty and samples were not taken

Tank “A”: ~1 PM

Tank “B”: ~1 PM

Tank “A”: ~5 PM, while filling


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Mask rinse/storage tank: ~4 PM

Day 1

Day 2


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