Suggestions(5)
The phrase "unsuitable for purpose" is grammatically correct and is commonly used in written English.
It is typically used when describing something that is not suitable or appropriate for its intended use or purpose. Example: The laptop that I bought was unsuitable for purpose because it constantly crashed and could not handle basic tasks.
Similar(60)
The actual measurements on the samples of the roof and wall strata from the exploration boring are reliable but the related holes are far apart, thus unsuitable for design purposes.
The currently available mathematical models are unsuitable for use for the purpose because they do not consider the effects of formation fluid influx, Joule Thomson cooling, and entrained drill cuttings.
Analysis of water quality for drinking purposes of all the rivers by means of water quality index also concluded that water was found unsuitable for drinking purpose, while found fit for irrigation purpose.
The Kelly's ratio of 1 or less than 1 is an indication of good quality water for irrigation purpose, whereas above one is suggestive of unsuitable for agricultural purpose due to alkali hazards (Karanth 1987).
This made the water unsuitable for drinking purpose.
The plot of Na % against EC (Wilcox diagram) also shows that, maximum samples are doubtful to unsuitable for irrigation purpose.
Adopting this scheme, studied samples are found in permissible to excellent range while few are unsuitable for irrigation purpose (Fig. 7a).
The total arsenic content in groundwater samples was higher than the safe limits of 10 µg/L set by WHO and BIS making water unsuitable for drinking purpose.
Water with SAR ranging from 0 to 3 is considered good and with greater than 9 is considered unsuitable for irrigation purpose.
If the MAR is <50 water is considered to be suitable and if MAR >50 water is unsuitable for agriculture purpose (Fig. 14a, b).
Generally, the agricultural out-put is low in the area, where the water quality is doubtful to unsuitable for irrigation purpose due to excess sodium salts in it.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com