Why a weekly 50% WC is better than two weekly 25% WCs

[rolandk10]

It seems cut and dry. After reading the thread, my impression is that some of those who disagree with you, 'feel' like the results are wrong. Perhaps after doing something for 20-30 years, the need to justify all the extra work is comforting.

Personally, I like that someone took the time to analyze something as redundant as a WC and make it more efficient. Whether it makes me change any of my procedures or not, at least I have some more data with which to decide.

 

[JteSchertz]

It seems cut and dry. After reading the thread, my impression is that some of those who disagree with you, 'feel' like the results are wrong. Perhaps after doing something for 20-30 years, the need to justify all the extra work is comforting.

Personally, I like that someone took the time to analyze something as redundant as a WC and make it more efficient. Whether it makes me change any of my procedures or not, at least I have some more data with which to decide.

On this I completely agree...

 

[JteSchertz]

if you take 2 = tanks (no matter the size, bio-load, type of fish or any other variable) and you change 50% of the water in one of those tanks and 25% x2 in the other, the tank with the 50% wc will have less dissolved ANYTHING on average and the same exact maximum amount of dissolved anything as the other tank.

the 50% tank will be more diluted (less pollution) every single time.

NOTHING will change that fact.

The variables I'm speaking of are bioload, type of filtration, how often you clean your filtration, how often you vacuum your gravel. All of these can affect your nitrate reading... Not just the water change.

If all of this can be factored in I think it could make the spreadsheet a more accurate depiction

 

[ScatMan]

The variables I'm speaking of are bioload, type of filtration, how often you clean your filtration, how often you vacuum your gravel. All of these can affect your nitrate reading... Not just the water change.

you do realize that we're talking about 2 = tanks right?

that means any change you make to the one, you would make to the other, be it vacuum the gravel or clean the filter or change the filter.

we are NOT discussing how to reduce nitrate. we are talking about one simple thing and only that ONE thing: water changes.

and these water changes are more efficient when done larger rather than more frequently.

If all of this can be factored in I think it could make the spreadsheet a more accurate depiction

these factors would have NO bearing on the outcome, do you understand that? therefore, they don't need to be factored in. you might as well factor in what you ate for breakfast, it's irrelevant.

 

[ScatMan]

the factors you're talking about could have tremendous bearing on the nitrate but again, it still does not change the simple fact that......

"1 large water change keeps your concentrations at a lower minimum (therefore lower average) than multiple smaller water changes adding up to the same volume over the same period of time."

 

[JteSchertz]

the factors you're talking about could have tremendous bearing on the nitrate but again, it still does not change the simple fact that......

"1 large water change keeps your concentrations at a lower minimum (therefore lower average) than multiple smaller water changes adding up to the same volume over the same period of time."

So if a person never cleans out there filters, or vacuums their gravel the results will be the same as long as they do a 50% water change once a week?

Done arguing this....good luck to you in your future fishkeeping

 

[FSM]

What a wonderful thread full of unsubstantiated claims and dismissal of basic math.

 

[Peacock Rey]

I do 50% WC twice a week....keeps the water clean !!!

 

[ScatMan]

So if a person never cleans out there filters, or vacuums their gravel the results will be the same as long as they do a 50% water change once a week?

yes, these factors have no bearing on the results of the 2 water change methods previously mentioned. do you not understand that?

the ppm may change based on these other variables but it will NOT effect the ratio between the 2 water change methods previously mentioned. you'll always have a lower average ppm with the larger water change rather than multiple smaller ones.

am i a parrot?

 

[JteSchertz]

yes, these factors have no bearing on the results of the 2 water change methods previously mentioned. do you not understand that?

Alright, now I think I understand what your trying to say...though the nitrate levels would be higher without doing the filter cleaning/gravel vac they would be affected in the same way as described on the spreadsheet. Meaning they would be decreased at the same rate...right?