Assessing a Water Sample 2017-09-19T19:17:13+00:00

Assessing a Water Sample

Step 1


Collect a minimum of 500ml of the effluent that you wish to sample.

Do not use the OMA tube.

Step 2


Check the OMA tube is clean by wiping inside and out with a clean cloth. Place the OMA sample tube on a flat service.

Ensure that the tube is not in direct sunlight.
(This is easily done by using your shadow.)

Step 3


With the cap with the aperture hole at the top, select ‘camera’ on your smart device and ensure it is in portrait mode. Place the lens of the camera over the hole and position the red cross so that it is approximately in the centre of the Secchi disk. Most smart devices will display a focus box.

Step 4


Remove the cap with the aperture hole and pour the sample water into the OMA tube up to the level line on the side.

Step 5


Ensure the OMA tube is still sitting on a flat surface, in the shade or your shadow and with the sample filled to the level line.

Place the cap on the tube, select ‘camera’ on your smart device and again check that it is in portrait mode. Place the lens of the camera over the hole as you did for the baseline photo and position the image on your device so that it is in the centre of the aperture hole.

NOTE: If you cannot see the Secchi disk in the image on your device, you still need to take the photo to allow the device to compare minute variations in the image. The OMA app will display a focus indicator.

Take the photo and accept the image.

OMA algorithms will automatically analyse this image to the baseline photo of the empty tube (Step 3) and return an indicative value for the Total Suspended Solids (TSS) to the screen of your device. This image will be automatically stored.

You can now enter comments on the condition of the facility and / or land-application area. You can also provide any advice to the facility owner, such as “the facility requires pump out” and have this recorded on the database along with the sample results. In this way, the OMA app builds a comprehensive service and operation history of every facility.

If a test is not completed when it is due, OMA will return an “Overdue Service” reminder in the database.

NOTE: OMA will only allow the entry of a new test if the device with the OMA app is within a predefined distance of the GPS co-ordinates of the address/facility site you are testing.

Additional OMA App steps for:


If the facility being tested has above-ground disposal, a field will present for you to enter the Mg/l of Chlorine from 0.0 to 3 m/gl. It will flag red if outside the required range of 0.5 to 2 mg/l. This indicates unsafe chlorine levels if below 0.5 or that the chlorine may run out before the next service if it is dosing at more than 2mg/l. High chlorine levels will impact the environment and kill grass and beneficial bacteria in the soil.


All facilities are impacted by poor sludge management. After measuring the sludge level, you enter the percentage of sludge using the level picker. A level 60% or higher indicates the need for the septic tank or facility to be pumped out as soon as possible.

Disposal / Land Application Area

If the disposal area requires attention, detailed comments can be entered in the comment field.