Bids Are Invited For Acquisition Of Filter Materials For Water Treatment With The Objective Of Meeting The Demands Of Autonomous Water And Sewage Service.
Bids Are Invited For Acquisition Of Filter Materials For Water Treatment With The Objective Of Meeting The Demands Of Autonomous Water And Sewage Service.
Washed Rolled Pebble Classified Size 1/16” To 1/8” Must Be Consisting Of Rounded, Non-Friable Fragments Found In Riverbeds Or Deposits, Visually Free Of Dirt, Mica, Sand, Silt, Clay, Dust And Organic Impurities. Specification Of The Filtering Gravel Layer, With The Following Specifications:•Size: Between 1/16” To 1/8”;•Less Than 25% Of The Mass Of The Gravel Can Be Formed By Fractured Or Angular Pieces;•The Percentage Of Thin, Laminated Or Elongated Pieces, In Which The Largest Dimension Exceeds 3X The Smallest Dimension, Must Be Maximum 2%;•Solubility In Acid Cannot Exceed 10%, In The Case Of Gravel ≫ 9.5Mm, And 5%, In The Case Of Gravel ≪ 9.5Mm;•No More Than 8% Of The Mass Must Be Larger Or Smaller Than The Specified Size Or Size Limits., Washed Rolled Pebble Classified Size 1/8 To 1/4 Must Be Consist Of Rounded Fragments, With The Following Specifications:•Size: Between 1/8” To 1/4”;•Less Than 25% Of The Mass Of The Boulder May Be Formed By Fractured Or Angular Pieces; Angular;•The Percentage Of Thin Pieces, Washed Rolled Pebble Classified Size 1/2 To 3/4 Must Be Made Up Of Rounded Fragments, With The Following Specifications:•Size: Between 1/2” To 3/4”;•Less Than 25% Of The Mass Of The Boulder May Be Formed By Fractured Or Angular Pieces;•The Percentage Of Pieces Thin, 5Mm;No More Than 8% Of The Mass Must Be Larger Or Smaller Than The Specified Size Or Size Limits. Uniformity: 1.4 To 1.7 Mm;•Visually Free From Clay, Gravel And Other Foreign Materials;•Solubility In Acid Less Than 1%., 10/29/2025 - 15:52:06, 10/29/2025 - 15:52:07, Special Rolled Filter Sand For Filters Must Be Constituted Of Grains Of Siliceous Material, Visually Free Of Dust, Clay, Mica And Organic Matter, With The Following Specifications: •Effective Size: From 0.55 To 0.65 Mm;•Uniformity Coefficient: From 1.7.
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