How to get the level of hardness you need.

[shrimpster97]

Heres something that should help you out ALOT! if you need it.


Step 1: Draw a square

Step 2: Place the GOAL hardness level in the square.

Step 3: Place the actual hardness level of your tank's water by the top left square.

Step 4: Now put the hardness level of the special RO warer in the bottom left square.

Step 5: Now subtract number diagonally (your Goal minus the actual hardness of your water. (and put that number at the bottom right of your square)

Step 6: Now subtract the other way diagonally. (your goal minus RO water) Remember, the bigger number goes into the calculator first. (and put that number at the top right of your square)

Step 7: Now add (+) the numbers on the right side of the square.

You need to know that the top right side of the square represents TAP water.

The bottom right side of rhe square represents the RO water.

Step 8: Now take the top (TAP) number from you problem and make it into a division problem using the the answer you got from adding the right sides.

**only need to write the first two numbers behind the decimal point.

Step 9: Now do the same type of problem for the RO number.

Step 10: Now take the answer from the tap and the and the answer from the RO and change them into percents.

What does this mean? your tank needs:

__% Tap water
and
__% Special RO water in order to lower your tank's hard ness level from a what you have now to what you need.







That^^ may have been confusing to some but i promise it will work if you follow the instructions. if you need the visual i have it i could scan if you need.

 

[Bignose]

shrimpster, this seems confusing.

May I propose a little simpler calculation:

T/G = n

T = hardness of your tap water
G = your goal hardness (the hardness you want in your tank)

n-1 = parts of RO water (assumed zero hardness) to 1 part of your tap water you want to use.

Example:
You tap water measures 24 deg GH. You want 8.

T/G = 24/8 = 3 = n

n-1 = 3-1 = 2.

So, you would use 2 parts RO water to 1 part tap water. You can always change parts to percentages if you like: % RO = parts RO / total parts = parts RO/ (parts RO +1). So, in this case % RO = 2/(2+1) = 2/3 = 67%

T and G can be measured in any unit, degrees or ppm, as that unit cancels with itself in the ratio, just both numbers have to have the same units.

 

[shrimpster97]

hey, that works.