A good way to predict the effectiveness of an acid is by means of the so-called “marble block” test method. This test is a good way to predict an acid’s performance under practical conditions. To test the descaling performance, a marble block is submerged in a test solution for several minutes. The weight is measured before and after.
Several marble chips of similar size and shape were weighed to determine the baseline weight of each piece. The selected chips were then immersed in the products at vendor recommended dilutions and allowed to soak for 18 hours. The marble chips were removed from the products and rinsed in a tap water spray at for 1 minute to remove loose material from the chips. Then the chips were dried for 15 minutes using a Master Appliance Heat gun at 500 F. When the chips cooled to room temperature, final weights were recorded to determine weight loss, if any. Observations were made after the initial immersion of the chips into solutions (5 minutes), at 60 minutes and then following the overnight immersion.
In addition to the 4 products from the soil removal test, 2 additional products were included for hard water stain removal.
Trial Results:
The current toilet bowl cleaner from TMI was by far the most effective hard water stain remover based on weight loss of the marble block and visual observations. The PC 120 was the second most successful product from the previous trial. The two additional products, DFC Restroom and CLR, also were effective at low concentrations. The table lists the amount of calcium removed from the marble and the observations on the process.
Product
Initial wt
Final wt
Diffeerence
%Wt loss of block
Ave
TMI Toilet Bowl - porcelain
16.9467
16.6224
0.3243
1.91
3.91
7.1301
6.7089
0.4212
5.91
Tough Job - porcelain
14.6607
14.6712
-0.0105
-0.07
-0.06
9.8936
9.8993
-0.0057
-0.06
7th Generation All Purpose - porcelain
20.2033
20.1934
0.0099
0.05
0.12
7.1918
7.1781
0.0137
0.19
PC120 - ceramic
13.4153
13.3580
0.0573
0.43
0.33
8.4230
8.4028
0.0202
0.24
DFC Restroom
19.8850
19.6572
0.2278
1.15
1.40
4.8122
4.7330
0.0792
1.65
DFC CLR
11.4138
11.3263
0.0875
0.77
1.19
4.0115
3.9467
0.0648
1.62
Visual Observations
Product
Initial
5 min
60 min
18 hr
TMI Toilet Bowl - porcelain
Aggressive
mild
particles collecting on bottom
particles collecting on bottom
Tough Job - porcelain
little
little/none
white haze
particles collecting on bottom
7th Generation All Purpose - porcelain
none
none
none
PC120 - ceramic
none
none
little
particles collecting on bottom
DFC Restroom
slight
slight
none
particles collecting on bottom
DFC CLR
none
none
none
particles collecting on bottom
Success Rating:
A follow up test, usually based on company input.
Conclusion:
Additional marble block testing will be conducted to try and identify more effective alternatives to the current cleaning product.
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