I don't think I follow your point.
The guy wants to know if he should use a phosphate remover before or after
the water change. Then the topic changed to volumes and everyone was on
topic.
I am sure that performing a water change before adding any remover is the
only way to go.
I understood every reply posted, then you came along!
Either you didn't write what you were thinking or you were drinking before
posting.
It just doesn't make sense.
A 15% water change of "concentrated" water (I will assume you meant with a
high reading of PO4) you claim that is the same 30 gallons of diluted water?
You must be on drugs!
If this isn't what you meant I am sorry but you have us used to the most
ridiculous comments.
Now, read this again and tell us what it means...

"If you add 30 gallons worth of sea water strength water, or it's equivalent
value of diluted strength, you are still only removing from your tank a 30
gallon equivalent of phosphate."

In Mexico that is called a CANTINFLADA. Any Mexican here will know what I
am talking about. (BTW, I am not Mexican but like Cantinflas the comedian)

iy

"Wayne Sallee" wrote in message
ink.net...
Actually the only thing that you are accomplishing, is that you are
waisting less RO water. That's the only thing that you are accomplishing.

If you do a 15% water change, then you are still doing a 15% water change
even if the water is more concentrated.

If you add 30 gallons worth of sea water strength water, or it's
equivalent value of diluted strength, you are still only removing from
your tank a 30 gallon equivalent of phosphate.

Wayne Sallee
Wayne's Pets


KurtG wrote on 3/13/2007 11:51 AM:
George Patterson wrote:
drain my
tank down to a specific point on the glass (ie. 25 gallons low),

Yep, it's less efficient, but it does enable the mark on the tank
technique which seems to be more or less standard based on every book
I've read.

I opted against this for two reasons:

1- less efficient at removing waste as you're diluting your tank before
draining a percentage.

2- what if you over drain by accident? If you have enough extra salt
water, you're in luck; otherwise, you're mixing up more salt water.

3- you're limited to draining only xx%. What if you want to do lower
cleaning and/or more siphon cleaning?

I'd rather keep it a bucket and use it for make up (if needed) after the
silt settles a bit. If you do that, there's no advantage to the mark on
the tank technique and a few disadvantages.

I guess it's less of a big deal now as I keep my evaporative makeup at
less then a gallon.

--Kurt