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How to Make Water Soft By Using RO Water
 
       
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INTRODUCTION

There are situations when we want to make our aquarium water soft and lower our pH.

One of best ways to achieve this is to is to mix RO water in aquariums.

RO refers to Reverse Osmosis filters, which gives you nearly pure water having Gh=0 Kh=0, however most filters have a range so choose a filter to suit your source water.

Pure RO water should never be used in aquariums, this is because as it has KH=0 which means that there is no buffering capacity in this water and ph swings are very wild.

Please go through this before start to change your water parameters.

What are water parameters ?

This is a sample of my aquarium parameters

TANK DATA

  • Tank Volume =170 lit

  • Tank water GH = 600 ppm

  • Tap water Gh = 600 ppm

  • RO water GH= 50 ppm ( might be lower depending upon your RO system)

  • Target GH = 340 ppm or 19 gh

  • Water Change Frequency = weekly

  • Water Change % = 50 %

This process has to done slowly so that fish are not stressed and do not suffer

 

 

 

PROCESS

I change 50% of water every week or 85 liters. My target Gh is 340 ppm or 19 gh.

As stated above I intend to change 85 lit (50%)of water every week.
To achieve my target I use 40 lit of RO water and balance 45 lit of tap water.

This means my 85 liter of new water has a GH of which is calculated as below
( RO water volume X RO water hardness) +(Tap water volume X tap water hardness).

Divide this by 85.

So you get [(40 X 50) + ( 45 X 600) ] / 85 = 341 ppm or 19.07 dh

Now when we begin I take out water of GH 600 in my tank and replace it with water of GH 341 ppm.

Now my resultant ppm at the end on first week is. [(85 X 341) + ( 85 X 600) ] / 170 = 470 ppm.

Next week I start with my tank water at 470 ppm, take out 85 lit of water replace it with 341 ppm water.

After 9 weeks, my tank will have a ppm of 341 or 19 which was my target ppm.

 

 
     
Spread sheet for Calculating Water hardness
 
Total Tank Volume : 170 liters
Water change % : 50 %
Water Change volume : 85 liters
Water Change Volume- RO : 40 liters or 47% of total with Gh = 50 ppm
Water Change Volume- RO: 45 liters or 53% of total with Gh = 600 ppm
Week
Tank
RO
Tap water
Resultant Water

 

Volume

GH

Volume

GH

Volume

GH

GH

 
lit
ppm
lit
ppm
GH
(ppm)
(dh)
Beginning
170.00
600.00
600.00
33.54
1
85.00
600.00
40.00
50.00
45.00
600.00
470.59
26.30
2
85.00
470.59
40.00
50.00
45.00
600.00
405.88
22.69
3
85.00
405.88
40.00
50.00
45.00
600.00
373.53
20.88
4
85.00
373.53
40.00
50.00
45.00
600.00
357.35
19.98
5
85.00
357.35
40.00
50.00
45.00
600.00
349.26
19.52
6
85.00
349.26
40.00
50.00
45.00
600.00
345.22
19.30
7
85.00
345.22
40.00
50.00
45.00
600.00
343.20
19.18
8
85.00
343.20
40.00
50.00
45.00
600.00
342.19
19.13
9
85.00
342.19
40.00
50.00
45.00
600.00
341.68
19.10
10
85.00
341.68
40.00
50.00
45.00
600.00
341.43
19.08
11
85.00
341.43
40.00
50.00
45.00
600.00
341.30
19.08
12
85.00
341.30
40.00
50.00
45.00
600.00
341.24
19.07
13
85.00
341.24
40.00
50.00
45.00
600.00
341.21
19.07
14
85.00
341.21
40.00
50.00
45.00
600.00
341.19
19.07
15
85.00
341.19
40.00
50.00
45.00
600.00
341.18
19.07
16
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
17
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
18
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
19
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
20
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
21
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
22
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
23
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
24
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
25
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
26
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
27
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
28
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
29
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
30
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
31
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
32
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
33
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
34
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
35
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
36
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
37
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
38
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
39
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
40
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
41
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
42
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
43
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
44
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
45
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
46
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
47
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
48
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
49
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
50
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
51
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
52
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
53
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
54
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
55
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
56
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
57
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
58
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
59
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
60
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
61
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
62
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
63
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
64
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
65
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
66
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
67
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
68
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
69
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
70
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
71
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
72
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
73
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
74
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
75
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
76
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
77
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
78
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
79
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
80
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
81
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
82
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
83
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
84
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
85
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
86
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
87
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
88
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
89
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
90
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
91
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
92
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
93
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
94
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
95
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
96
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
97
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
98
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
99
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
100
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
101
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
102
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
103
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
104
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
105
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
106
85.00
341.18
40.00
50.00
45.00
600.00
341.18
19.07
               
   

Author/Credits

  Sandeep Raghuvanshi
Picture Credits   Wikipdeia and other sources which have released under GNU, unless specifically credited
CITATIONS/FURTHER READING  
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