Deep Sand Beds - do they work?

[Eric]

also for those worry about Hydrogen sulfide

"Hydrogen sulfide is an amazingly toxic gas, but that toxicity is exceeded by its pungent rotten-egg odor. The gas will have an exceptionally strong odor, and will seem overwhelming at levels well BELOW toxic amounts. If you can smell this stuff without it literally taking your breath away, it won't be at a harmful concentration. There is no real evidence to indicate that it may reach toxic levels in a deep sand bed."

Base on the MSDS of H2S (Hydrogen Sulphide), if the amount is more than 10ppm it will block off or kill your smelling nerve and you will no longer sense the pungent smell. Anywhere above 100-1000ppm, you will be brain dead.

p/s: Never trust your nose to measure H2S.

2 cents worth......

[alanseah]

well eric.. if your tank can produce up to 10ppm..

then sometime will be very very wrong with you tank...