Using Chlorine Bleach to Control (Kill) Algae in
Some of the leading
pool experts are advocating that pool owners should use standard
Bleach (5.25% sodium hypochlorite) as a method to control algae, along
with keeping the chlorine at
"shock" levels (over 10ppm) for extended periods of time. While this makes better
economical sense than paying for expensive "pool chlorine"
which is simply a higher concentration solution, there
is a little more to it than what first meets the eye, for us to call
this "good advice".
Let's take a closer look at the problem.
First of all, all pool owners know that they must backwash their
system from time to time. This means that a considerable
amount of water is discharged either to public waste systems, or
even worse, directly into groundwater supplies. If your
drinking water source is from a private well, and you dump your
pool water waste on your property, we HIGHLY recommend that you do
not use this method, or you could risk contaminating your well!
Here's a good article to review if you are skeptical
about how bad chlorine actually is for you:
Speaking About the Dangers of Chlorine
Industries are closely monitored by the EPA on how much chlorine
they discharge as wastewater. Why is this? It is because
it is known that chlorine can have very harmful effects to our
environment. Discharges of this type often contain high levels
of Trihalomethanes (THMs), something pool owners currently do not
have to monitor in their pools, however strict guidelines have been
established by the EPA regarding THM's in drinking water.
Click here for more enlightenment concerning THM's. What you read and learn will no doubt
be concerning (or even shocking) to you as a pool owner. You will find that
THM's are the "dirty little secret" of the pool and spa industry.
They just simply do not like to talk about it, as it could be very
bad for business.
THM's are created as byproducts of disinfection systems using
chlorine. THM's are found
to be very harmful to humans, and are listed as some of the highest
(top 10) threats as carcinogens. The worst thing about it
is that THM's are easily absorbed by humans through the skin.
This means that swimming in water with high THM levels may
actually be worse for you than drinking it!
According to the new EPA guidelines,
the levels of THM's (Trihalomethanes) in drinking water
should not exceed 100 ppb (parts per billion). However,
even this level is no longer considered safe, and new
standards of 40 ppb are in the process of being
THM's In Swimming Pools
swimming pools THM's may accumulate in very high
concentrations, especially if a recent shock treatment
is done. Red eyes and rashes are the most instant and
obvious effects, and should be considered signals of a
potentially more serious risk to human health. Since
makeup water is used to dilute these dangerous
compounds, as a result, an amount of pool water (equal to
the makeup dosage) must be released into the
flocculation of organic
waste, and then filtering the waste, can help reduce THM
levels, by leaving less waste in the pool for chlorine
(or bromine) to react with.
It should be noted that the
best pools have their water quality in compliance with
drinking water standards.
Q: So why doesn't the EPA have guidelines on THM's in pool
A: Great question.
Q: Why don't pool test kits include testing for THMs so I
can at least know what the level is in my pool?
A: Another great question. Testing for THMs is quite
costly and can not be done (as far as we know) with low cost user
"test kits" available on the market. If someone offers this
product at low cost, we would be happy to provide it to our clients.
Here is a link to one
THM test kit offered by Hach. At
over $400 per test kit, we don't think
many domestic pool owners will run out and buy one...
Q: If I use bleach in my pool to control algae, with this increase THM
A: Yes, most certainly. THMs are a byproduct reaction
of chlorine on biomatter. It doesn't matter whether you use "bleach"
or "pool chlorine" to shock a pool, (except from a cost standpoint)
because either way THM levels will skyrocket. Once the chlorine
levels are brought back down to normal levels (1.5 to 3.0 ppm),
the algae is likely to return anyway.
The fact of the matter is that if every pool owner in the USA
started using shock levels of chlorine bleach for extended periods
of time as the method to control algae in
their pool, millions of gallons of additional contaminated water would be
discharged into our environment. The effects of this would no
doubt be devastating to the environment, and public health.
There is no denying this fact. Exactly how bad it would be
would make a great study.
We are quite certain that pool owners do not want to
intentionally damage the environment. We believe that most
pool owners just want to maintain their pools the best way they can,
and know how. Chemical companies are in business to sell
chemicals. They have no problem promoting the idea that
using their products is the only way to maintain pools. Up
until now, unfortunately, this was in fact mostly true.
Now, with the availability of new emerging technologies, pool owners
DO have a choice. A choice which makes both good economic
and good environmental sense.
So, what new technologies can help pool owners?
Do we think that the pool experts are trying to promote damage
to our environment?
No, we are quite sure that they are simply trying to help people
deal with algae in the most cost effective manner thought available,
however their guidance is somewhat short-sighted as far as our environment is concerned. Using chlorine bleach to
control algae may be more of an ethical problem than an economical
one, however when one thinks about the long-lasting consequences, it
must be considered.
When you think about the fact that the average homeowner
only discharges a couple cups of bleach a day into our wastewater
systems, typically by doing laundry, being a pool owner gives us
additional responsibilities we must be aware of, which impacts our
environment as a whole.
The bottom line is, why use bleach to manage algae if
it can be better managed by using environmentally friendly methods?