- Jul 22, 2008
- 144
It seems conclusive that borates can be helpful in suppressing algae. Does anyone know how or why? Any theories?
A 22 lb. dog should be safe drinking up to 10 fluid ounces per day.
I have given my dog a graduated cylinder with which to measure his intake but all that idiot wants to do is fetch it.
PoolOwnerNumber9 said:Algal toxicity: Green algae, Scenedesmus subspicatus 96-hr EC10 = 24 mg B/L†= 24 ppm.
Yes, Please!AnnaK said:PoolOwnerNumber9 said:Algal toxicity: Green algae, Scenedesmus subspicatus 96-hr EC10 = 24 mg B/L†= 24 ppm.
Can you please explain what these notations mean: 96-hr EC10?
Realize that the ppm borates that is normally expressed for pools is actually ppm boric acid and not boron. This will change your math. You might want to correct it.PoolOwnerNumber9 said:From: http://www.food.gov.uk/multimedia/pdfs/evm_boron.pdf
"The NOAELs for reproductive effects are 4.4 mg boron/kg bw/day in dogs and 9.6 mg boron/kg bw/day in rodents. Similar effects are observed in different animal species."
This means that a 10 kg (22 lb) dog could ingest up to 44 mg per day, or about .88 Liters (29.8 fluid ounces) of water with a 50 ppm borate concentration. However, to be conservative, I used a somewhat arbitrary 1.6 mg/ kg of body mass per day, everyday.
waterbear said:Could you put this in simperler terms so the majority of non technical forum users could benefit from it?
Actually, the ppm Borates for pools is measured as ppm Boron, not boric acid. It's true that the primary chemical species in pool water is boric acid with a small amount of borate ion, but the measurement is in ppm Boron. This is why Michael Beach's calculator was incorrect because he used the molecular weight of boric acid instead of boron. It's also why something seemingly as low as 50 ppm has a rather large effect on pool water buffering. 50 ppm Boron is equivalent to 286 ppm boric acid. You and I figured this out a long time ago and there are posts somewhere about it.waterbear said:Realize that the ppm borates that is normally expressed for pools is actually ppm boric acid and not boron. This will change your math. You might want to correct it.