running maint . and operation of swimming pool in shaheed amir chand govt . sarvodaya vidalaya , shamnath marg , delhi . ( sh- operation and maint . of swimming pool ) , cleaning of swimming pool by various acids and by back wasing method and filling of pool by filtration of water complete as reqd . at site and also after completion of work , a ) opening of top & bottom covers of filteration plant i/c cutting the rusted nuts & bolts and replacing the same , refixing the cover and other accessories after repairing & welding etc . as reqd . b ) empting the filteration plant by taking out the filter media & gravels etc from the filter dome and disposing the same outside the school premises etc . c ) screpping the inner surface of the filteration plant dome , cleaning properly , painting inner surface with black rubber paint over a two coats of primer etc . complete as reqd at sited ) dismentalling of exisint broken & wornout pre nozzles , cleaning the bottom from inside & outside , taping the nozzles holes to suit the new nozzle . , providing & filing silica filter mdium size 4 . 8mm , 8-16mm & silica gravels in the pressure filter tank for the filteration of swimming pool water etc . as reqd . complete for required results . , providing & fixing 150 mm long 13mm dia ( appx . ) umberlla type pvc nozzle with head having 8 lines of size 25mm x 3mm ( approx ) for the free flowing of water etc . as reqd . , a ) rmo swimming pool and keeping the water clean by using chemicals such as soda ash , alum , copper sulphate , sodium hydro chloride , bleaching powder , chlorine gas etc . everyday i/c sundays and holidays as and when reqd . i/c maintenance and operation of 2 nos . 7 . 5 hp filter pump and 1 no . 5hp submersible pump for make up of water as and when reqd . ( round the clock ) b ) rmo suction sweeper for cleaning of sediments settled at the bottom of the pool daily , i/c sundays and holidays to keep pool clean i/c replacement of nylon rope and brush etc . as reqdc ) providing the services of sweeper for day to day cleaning of surrounding area of pool as well as bathroom , toilet etc . complete as reqd at site . , providing and laying cement concrete in retaining walls , return walls , walls ( any thickness ) including attached pilasters , columns , piers , abutments , pillars , posts , struts , buittresses , string or lacing courses , parapets , coping , bed blocks , anchor blocks , plain window sills , fillets , sunken floor , etc . up to floor five level , excluding the cost of centering , shuttering and finishing 1:2:4 ( 1 cement : 2 coarse sand : 4 graded stone aggregate 20mm nominal size ) , testing of water of the pool by means of chlorine testing kit , orthotolidine solution , ammonium solution time for maintaing of good quality of water daily & submitting the report monthly to the department . , supplying and fixing of following sizes of medium class pvc conduit alongwith accessories in surface/recess including cutting the wall and making good the same in case of recessed conduit as reqd . a ) 40mm/ 50mm