AFR line replacement - underdosing adjustment question

[Rhetoric]

Question: Installing new doser line, how do I adjust the amount I dose.

While completing my tanks 3 yr maintenance (replaced heater, new doser, new ATO pump, pump/wavemaker clean) I noticed my 2 1/2 year old AFR line was very corroded (like a plugged artery)

I did a calibration test of 5 MLS and it was actually dosing 4.5 (checked a bunch of times)

The question.

Ive got the new line ready to install.

The app is set to dose 34 MLS a day. But it’s actually dosing 26.4 MLS due to the clog (math check?)

This feels like a dumb question (seems pretty straightforward) Iust dont want to cause a reef heart attack or stroke......

After I install the new line is and I recalibrate, should adjust the total amount dosed to 26.4?

This is a new one for me, just seems like an opportunity to screw something up and over dose. Am I missing anything? Anyone have advice here or alternative?

 

[Randy Holmes-Farley Verified Community Expert]

I'm not sure I understand that issue, but if you dosed 26 ml per day before and alk was stable, I'd dose that same amount now even if it takes less (or more) dosing time.

If alk is not trending the way you want, raise or lower the dose slowly, a little each day.

 

[KrisReef]

Question: Installing new doser line, how do I adjust the amount I dose.

While completing my tanks 3 yr maintenance (replaced heater, new doser, new ATO pump, pump/wavemaker clean) I noticed my 2 1/2 year old AFR line was very corroded (like a plugged artery)

I did a calibration test of 5 MLS and it was actually dosing 4.5 (checked a bunch of times)

The question.

Ive got the new line ready to install.

The app is set to dose 34 MLS a day. But it’s actually dosing 26.4 MLS due to the clog (math check?)

This feels like a dumb question (seems pretty straightforward) Iust dont want to cause a reef heart attack or stroke......

After I install the new line is and I recalibrate, should adjust the total amount dosed to 26.4?

This is a new one for me, just seems like an opportunity to screw something up and over dose. Am I missing anything? Anyone have advice here or alternative?

I think you are doing the right thing. Set the new to match the old and then monitor it going forward and adjust if /when it is needed.

 

[Evil1]

.5 ml over or under is acceptable when using a doser. Most times it’s under.5 so as far as I’m concerned you’re good.

 

[EnterName]

If it was dosing 4.5mL instead of 5mL, that is

4.5mL / 5mL = 0.9 = 90%​

of its intended dosage. So if it was set to dose 34mL each day, it was actually dosing

34mL ⋅ 90% = 34mL ⋅ 0.9 = 30.6mL​

each day. Therefore I would set the dosing pump to 30.6mL and observe if alkalinity remains stable.

I don't know where the 26.4mL is coming from. 26.4mL instead of 34mL would be approx. 78% of the intended amount.

Note: 0.5mL difference is probably within the error tolerance of the dosing pump, so the test with only 5mL wasn't very reliable/precise.

 

[JTP424]

Depending on your tube length, I found these that are small enough to use in dosing tubing...
Brush

 

[Sam7]

If it was dosing 4.5mL instead of 5mL, that is

4.5mL / 5mL = 0.9 = 90%​

of its intended dosage. So if it was set to dose 34mL each day, it was actually dosing

34mL ⋅ 90% = 34mL ⋅ 0.9 = 30.6mL​

each day. Therefore I would set the dosing pump to 30.6mL and observe if alkalinity remains stable.

I don't know where the 26.4mL is coming from. 26.4mL instead of 34mL would be approx. 78% of the intended amount.

Note: 0.5mL difference is probably within the error tolerance of the dosing pump, so the test with only 5mL wasn't very reliable/precise.

Most dosers have a adjustment for the difference after you calibrate it....well least mine does in the settings