BryceM

We'll hopefully be releasing a new version of the Fertilator soon which will address some long-standing bugs in the current version. I'm aware of the following issues. Please feel free to report any other bugs that you're aware of.

We appreciate everyone's patience with this issue. We've known about the problem for a long time but have been unable to find someone with the programming experience needed to make the fix. As you may recall, part of our fundraising drive a few months ago was to fix this and other known issues with the site. AquaticDave has graciously agreed to tackle this problem, and it looks like we'll finally be moving forward with the fixes.

Here's what I've compiled so far:

#1 (most important), On the "Get concentrations from Chemicals Added" page, when you enter a quantity into the the "amount" box in the phosphate row, it clears this quantity out when you hit the "calculate" button.

#2 - On the "conversion of tbs / tsp / Dash / pinch / smidgen / gram" page, the entry for MgSO4.7H2O reads 14.00 in the tsp column. It should read 4.00

# 3 - On the "Get concentrations from Chemicals Added" page there is an error in internal calculations regarding Fleets as a phosphate source. 1 ml of Fleets supplies 131.36mg of PO4. When 1 ml of Fleets is added to 1 liter of water it should provide 131.36 ppm, not 669 ppm that it currently reports. *** Note - there is some disagreement about the exact concentration. Some sources list 131.36 mg/ml and others report around 150 mg/ml. Either way, we'll be correct within 20% - a huge improvement over the current numbers. *** On the "Find amount of target chemical from given concentration" it's also pretty messed up. Using a 1 liter aquarium volume, a concentration of 131.36 ppm should give an "answer" of 1 ml to use.

#4 - When selecting Flourish Nitrogen, Flourish Phophate, or Flourish Potassium as a nutrient source, a result is being shown in the Iron (Fe) answer box. Calculations of NO3, PO4, and K for these products are correct, but these additives do not contain iron.

# 5 - Mg calculations have been reported as incorrect, but I'm unable to find the problem. Current calculations seem ok to me. Any ideas about this one?

Please report bugs only. If you'd like to incorporate new or additional features or chemicals, start a new thread.

I'll sticky this for a while, until we get ready to make the fixes.

BryceM

Nobody huh? I'll assume this is a complete list unless I hear otherwise in the next day or so.

Squawkbert

Review the Mg complaints - problem is probably with the 7H20 part - people don't know if theirs has the water or is anh. That may be the source of complaints.

BryceM

If people don't know what they're using, the Fertilator isn't going to be able to tell them. My understanding is that regular drugstore Epsom salts and MgSO4 from Greg Watson is in the form of MgSO4-7H2O. My check of the fertilator's math shows that it should be correct for MgSO4-7H2O.

Left C

off topic

BryceM

Back on topic.......

Is anyone aware of other bugs in the fertilator?

bigstick120

Here is another the PO4 window always resets to 0

http://www.aquaticplantcentral.com/f...es-kh2p04.html

BryceM

Yeah, that's #1 in my post above.

bigstick120

AAHHHH I see that now! Sorry

Left C

This is a question about the weight of MgSO4∙7H2O.

You are planning on using 4.00 grams per teaspoon.

Chuck's calculator uses 5.4 grams per teaspoon.

I just weighed 10 level teaspoons one at a time and the average weight was 5.61 grams per teaspoon which is close to Chuck's calculator amount of 5.4 grams per teaspoon.

Wikipedia lists that the density is 1.76 g/cm^3.
1 teaspoon = 5 mL = 5 cm^3.
So 1 teaspoon = 5 cm^3 * 1.76 g/cm^3 = 8.8 grams

What is the correct weight of 1 teaspoon of MgSO4∙7H2O?
4.00 grams, 5.4 grams, 5.61 grams, 8.8 grams, or ?