ALK SWING DURING WATER CHANGE

[fishybizzness]

Hi Randy. I have a question. On my current 120 gallon setup i try to keep my alk at around 8. I use nsw and it usually runs at a little over 7. There are times during days of rainfall that i don't like to collect water so i keep a bucket of IO regular on hand. The IO usually mixes at around 9-10 alk. My total water volume is around 105 gallons. I do a weekly 10 gal water change. How much do you think my alk will change doing this size water change? Thanks

 

[((FORDTECH))]

Hi Randy. I have a question. On my current 120 gallon setup i try to keep my alk at around 8. I use nsw and it usually runs at a little over 7. There are times during days of rainfall that i don't like to collect water so i keep a bucket of IO regular on hand. The IO usually mixes at around 9-10 alk. My total water volume is around 105 gallons. I do a weekly 10 gal water change. How much do you think my alk will change doing this size water change? Thanks

You could always use muric acid (spelled wrong) in your io water to lower alk. A little goes a long way so be careful. I use 40ml in 100gallons of mixed iorc to get it from 12ish to 7-7.5ish

 

[fishybizzness]

How ling do i have to mix it before use?

 

[fishybizzness]

How long, not ling.

 

[dwest]

Deleted

 

[Waters]

Hi Randy. I have a question. On my current 120 gallon setup i try to keep my alk at around 8. I use nsw and it usually runs at a little over 7. There are times during days of rainfall that i don't like to collect water so i keep a bucket of IO regular on hand. The IO usually mixes at around 9-10 alk. My total water volume is around 105 gallons. I do a weekly 10 gal water change. How much do you think my alk will change doing this size water change? Thanks

I will let Randy answer, but changing 10 gallons in a 105 gallon system isn't going to change your ALK much, if at all.

 

[((FORDTECH))]

How ling do i have to mix it before use?

Sorry I should have included this but forgot cause been doing for so long. After adding acid you much use air stone to off gas water to get ph back up. Generally I do this for 48 hours then use water

 

[((FORDTECH))]

How ling do i have to mix it before use?

So I add water then salt and a mixing pump for 10 min then add air and acid and let mix with air for 48 hours then I’m 100% sure it’s good for me

 

[TheDragonsReef]

Formula is:

Water change volume ÷ tank volume = percent of water being changed.

For you its 10/105= 0.095....

Then alk of new water - alk of old water

10-8=2

Then difference of alk × percent of water change

2 × 0.095 = 0.19

So if you do a 10g water change with alk of 10 in 105g water volume with alk of 8 you would see an increase of roughly 0.2dkh.

 

[fishybizzness]

I could d

Formula is:

Water change volume ÷ tank volume = percent of water being changed.

For you its 10/105= 0.095....

Then alk of new water - alk of old water

10-8=2

Then difference of alk × percent of water change

2 × 0.095 = 0.19

So if you do a 10g water change with alk of 10 in 105g water volume with alk of 8 you would see an increase of roughly 0.2dkh.

I co

Formula is:

Water change volume ÷ tank volume = percent of water being changed.

For you its 10/105= 0.095....

Then alk of new water - alk of old water

10-8=2

Then difference of alk × percent of water change

2 × 0.095 = 0.19

So if you do a 10g water change with alk of 10 in 105g water volume with alk of 8 you would see an increase of roughly 0.2dkh.

I could definitely live with a .2 dkh swing! I don't use artificial seawater often but just didn't want to cause any big swings in my parameters.

 

[Hairyteeth]

How long, not ling.

Ling cod where?

 

[fishybizzness]

This is the stuff I found at home depot but I would rather not add any if not needed

 

[fishybizzness]

I could d

I co

I could definitely live with a .2 dkh swing! I don't use artificial seawater often but just didn't want to cause any big swings in my parameters.

Crazy stuff going on with my phone today...

 

[((FORDTECH))]

I could d

I co

I could definitely live with a .2 dkh swing! I don't use artificial seawater often but just didn't want to cause any big swings in my parameters.

This is what I bought from Home Depot

 

[Randy Holmes-Farley Verified Community Expert]

For small water changes like noted above, the alk change is very small and not worth worrying about.

 

[fishybizzness]

Thanks for all the responses! This forum is amazing!