Macro Solution
33g Potassium Nitrate (KNO3)
7.2g Potassium Phosphate (KH2PO4)
Dosing
250ml Water5ml of Macro solution per 50 litres of water
2.5ml of Trace solution per 50 litres of water
368 litres Aquarium
368L/ 50L = 7
= 7 lots of 50L
= 7 x 5ml = 36ml of macro to treat 368 litre
Dosing 36ml of macro 2x weekly.
How much will 250g of KNO3 salt LAST?
For dosing a 250ml bottle of Macro mix 33g of KNO3 with 250ml of water.
250g salt /33g salt = 7.5
= 7.5 or 71/2 lots of 33g of KNO3 salt
So now we know 250g KNO3 will make 7.5 batches mixing at 33g each.
The recipe requires us to mix 33g of KNO3 to 250ml of water
So,
250ml / 36ml = 6.9 (this calculation shows the amount of time I can dose 36ml of KNO3 from a 250ml bottle)
=6.9 / 2= 3.4 (now I divide the amount of time I can dose KNO3 from a 250l bottle by the amount of time weekly I will be adding KNO3 to the tank, this is added (2) times weekly)
=3.4 x 7.5 = 26Weeks (here I’m multiplying the amount of weeks a 250ml bottle will last (3.4W) by the amount of batches I can make from 250g of KNO3 salt (7.5))
So in theory 250g of KNo3 salt will last 26 weeks dosing a 368L tank.
For the other salt just use the same formula and modify the amount of salts required and recalculate and also the volume of your tank’s capacity.
How much will 250g of (KH2PO4) salt LAST?
For dosing a 250ml bottle of Macro mix 33g of KNO3 with 250ml of water.
250g salt /7g salt = 35.7
= 35.7 or 35.7 lots of 7g of (KH2PO4) salt
So now we know 250g (KH2PO4) will make 35.7 batches mixing at 7g each.
The recipe requires us to mix 33g of (KH2PO4) to 250ml of water
So,
250ml / 36ml = 6.9 (this calculation shows the amount of time I can dose 36ml of (KH2PO4) from a 250ml bottle)
=6.9 / 2= 3.4 (now I divide the amount of time I can dose (KH2PO4) from a 250l bottle by the amount of time weekly I will be adding (KH2PO4) to the tank, this is added (2) times weekly)
=3.4 x 35.7 = 121 Weeks (here I’m multiplying the amount of weeks a 250ml bottle will last (3.4W) by the amount of batches I can make from 250g of (KH2PO4) salt (7.5))
So in theory 250g of (KH2PO4) salt will last 121 weeks dosing a 368L tank.
For the other salt just use the same formula and modify the amount of salts required and recalculate and also the volume of your tank’s capacity.
EI dosing schedule
This would of been my normal dosing schedule but, because I'm not dosing co2 I am cutting back on the amount of ferts that are dosed
Date: 
Schedule: 
Dosage: 
Monday 
Add TNC Trace 
18ml 
Tuesday 
Add Macros 
36ml 
Wednesday 
Add TNC Trace 
18ml 
Thursday 
Take a breather! 

Friday 
50% water change then Add Macros 
36ml 
Saturday 
Add TNC Trace 
18ml 
Sunday 
Add Macros 
36ml 
Reduced EI dosing schedule
Date: 
Schedule: 
Dosage: 
Monday 
Take a breather! 

Tuesday 
Add Macros 
36ml 
Wednesday 
Add TNC Trace 
18ml 
Thursday 
Take a breather! 

Friday 
30% water change then Add Macros 
36ml 
Saturday 
Add TNC Trace 
18ml 
Sunday 
Take a breather! 
Reduced E.I Calculation
Macro Solution
33g Potassium Nitrate (KNO3)
7.2g Potassium Phosphate (KH2PO4)
Trace Mix Solution
10g Chelated Trace Element Mix (TNC Trace, CSM+B)
250 ml Water
Dosing
250ml Water5ml of Macro solution per 50 litres of water
2.5ml of Trace solution per 50 litres of water
368 litres Aquarium
368L/ 50L = 7
= 7 lots of 50L
= 7 x 5ml = 36ml of macro to treat 368 litre
Dosing 36ml of macro 2x weekly.
How much will 250g of KNO3 salt LAST?
For dosing a 250ml bottle of Macro mix 33g of KNO3 with 250ml of water.
250g salt /33g salt = 7.5
= 7.5 or 71/2 lots of 33g of KNO3 salt
So now we know 250g KNO3 will make 7.5 batches mixing at 33g each.
The recipe requires us to mix 33g of KNO3 to 250ml of water
So,
250ml / 36ml = 6.9 (this calculation shows the amount of time I can dose 36ml of KNO3 from a 250ml bottle)
=6.9 / 2= 3.4 (now I divide the amount of time I can dose KNO3 from a 250l bottle by the amount of time weekly I will be adding KNO3 to the tank, this is added (2) times weekly)
=3.4 x 7.5 = 26Weeks (here I’m multiplying the amount of weeks a 250ml bottle will last (3.4W) by the amount of batches I can make from 250g of KNO3 salt (7.5))
So in theory 250g of KNo3 salt will last 26 weeks dosing a 368L tank.
For the other salt just use the same formula and modify the amount of salts required and recalculate and also the volume of your tank’s capacity.
The cost of dosing liquid ferts compared to doing it diy with dry salts is very uncanny. By conjuring up your own mix can also give you the benefits on dosing your plants and targetting their needs more accurately and you know whats exactly is going into your system. Plus it saves you a pritty penny too!.
Bump for one of the most useful and cost effective subjects ever posted about on FTTV.
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