Dosing pump - 1 head, 2 hoses - dosing 2 part?

[OG-Goby]

Hi,

I have this old dosing pump. Looks like some rebadged hospital surplus…

It has one head, but is setup with 2 tubes. So it can dose 2 separate things at once.

I realize 2 part should not be dosed at the same time, however…

If I dose the alk in my sump in the first chamber while dosing the ca in the main tank, would this suffice to keep them from precipitating due to mixing?

I just hate to toss old but functional equipment.

If it matters it’s an IM50EXT with their RFS22 sump. Around 50 gallons total volume.

 

[Lavey29]

I still think you will get precipitation and what happens if you need slightly different dosing amounts of alk or cal?

 

[Garf]

Hi,

I have this old dosing pump. Looks like some rebadged hospital surplus…

It has one head, but is setup with 2 tubes. So it can dose 2 separate things at once.

I realize 2 part should not be dosed at the same time, however…

If I dose the alk in my sump in the first chamber while dosing the ca in the main tank, would this suffice to keep them from precipitating due to mixing?

I just hate to toss old but functional equipment.

If it matters it’s an IM50EXT with their RFS22 sump. Around 50 gallons total volume.

I don't think it would be an issue.

 

[mingc]

precipitation will accur most likely.

 

[Garf]

precipitation will accur most likely.

How, if they are mixed with saltwater before they combine? I did some tests with sodium bicarb and calcium chloride in saltwater and silly amounts can be added without visible precipitation.

 

[OG-Goby]

I still think you will get precipitation and what happens if you need slightly different dosing amounts of alk or cal?

I’m not afraid of adding a little manually of one or the other every once in a while based on regular testing.

 

[Lavey29]

How, if they are mixed with saltwater before they combine? I did some tests with sodium bicarb and calcium chloride in saltwater and silly amounts can be added without visible precipitation.

I guess when the substrate turns to concrete then you know.

 

[Garf]

I guess when the substrate turns to concrete then you know.

Well, that may happen with any high pH Alk supplement, even without the added calcium to be honest. As you know, there's quite a lot of calcium there already. I'm not sure that the concrete sand beds often reported in new tanks and forming rocks from adding high pH additives are even the same thing to be honest.

https://www.reef2reef.com/threads/exceeding-the-limewater-evaporation-limit.984542/post-11619824

 

[OG-Goby]

I guess when the substrate turns to concrete then you know.

While you aren’t wrong, in this case I am bare bottomed…

 

[Lavey29]

While you aren’t wrong, in this case I am bare bottomed…

Why don't you just dial in All For Reef and call it a day? One bottle one doser.

 

[dwest]

That hospital surplus pump might be very high quality. I’d keep using it. You might want to start another thread about it and how its maintained.

I also think you’d be OK dosing both parts at once in separate chambers of the sump as you described. Obviously this is debatable but I’d try it.