Sanitation Storage Solutions: Conservancy Tanks

Store and dispose of both black and grey water with our Conservancy Tank Solutions.

Conservancy Tank Solutions

As it is chemical-resistant, conservancy tanks are used to dispose of both black and grey water. It serves as temporary storage only, requiring the waste to be pumped out whenever the tank is full. This is done by licensed hauling companies who dispose of the waste accordingly.

Conservancy Tank Benefits

  • Minimum maintenance required (except for the periodic emptying of the tank)
  • Provides a safe temporary storage solution for black & grey water
  • Flexible and adaptable to meet a wide variety of individual household waste disposal requirements
Conservancy Tank Benefits

System Components

System Components

1. Tank

Conservancy tank in required size. All conservancy tanks are supplied standard without fittings, as the contents need to remain inside the tank until pumped out.

The required volume will depend on how often the tank will be pumped out and the amount of people using the facilities on a daily basis.

To calculate your required size, take the below numbers and multiply with the amount of people:

Hand/Face Wash: ± 1-4 L
Toilet Flush: ± 3-7 L
Bath: ± 50-150 L
5 min Shower: ± 80 L
45kg Laundry: ± 80 L

2. Pipes – 110 mm SV pipes

Lengths will vary based on the installation.
2a. From feed from house to the first elbow
2b. From first elbow to elbow extending out of the tank

3. Elbow – 110 mm

According to pipes

Note

This is a guideline for a basic installation. Each installation will vary based on the setup and your personal preference. We recommend using a professional to installation this system.

Maintenance

Although conservancy tanks are fairly maintenance-free, there are a few things you can do to ensure that your system functions properly.

1. Ensure that proper installation procedures are followed.

It is vital to follow all installation guidelines and manufacturer specifications to ensure proper functionality and reduce maintenance after installation.

2. Ensure lid remains in place.

When installing the tank, the lid is filled with concrete prior to use to ensure that it stays closed off. It is, however, important to double-check every now and then to make sure that nothing falls into the tank or no effluent leaks out of the tank (effluent is not safe and carries disease-causing germs).

3. Keep a watchful eye.

If you notice any of these warning signs, contact a professional septic company/preferred installer immediately for assistance:

• Surfacing sewerage or wet spots
• Gurgling sounds in the plumbing system
• Slow draining fixtures

Maintenance

Installation Guide

Pre-installation Part 1

1. Tank placement

The location of a conservancy tank should be considered and it must be placed on soil with a bearing capacity greater than 120 kPa.

Avoid installing the tank:
• In water-saturated clay or an area that is frequently flooded
• Where depth to bedrock is less than 2.5m
• In the path of vehicles/heavy equipment
• Where underground services are expected (i.e. electric cables, water and sewer pipes, gas lines, etc.)

2. Soil Classification

If bearing capacity cannot easily be determined, use the provided method of soil classification, which will also assist in determining suitable backfill material.

CATEGORYBEARING CAPACITYVISUAL APPEARANCESQUEEZED IN HAND & PRESSURE RELEASED
RockYesSufficientRock, Slate, Shale etc.-
Coarse-grained Soil: GravelYesSufficient- Coarse to very coarse
- Small stones & particles
- Free-flowing
-
Coarse-grained Soil: SandYes


No
Coarse/medium sand is sufficient

Fine sand is NOT sufficient
- Granular appearance (individual grain sizes detectable)
- Free flowing when dry
- Lighter to brownish colours
- Won’t form a cast when dry & falls apart
- Wet cast crumbles when lightly touched
Fine-grained soil: SiltNo- NOT Sufficient- Very little fine sand
- Cloddy when dry & soft flourlike feel
- Readily pulverises to powder
- Darker colours (green, blue & black)
- Cast can be handled without breaking
- Readily puddles when wet
Fine-grained soil: ClayNo- Hard homogeneous clay may be sufficient
- Clay is mostly NOT sufficient
- Fine textured, breaks into very hard lumps when dry
- Difficult to pulverise into soft flourlike powder
- Cohesive when moist & shrinks when drying
- Darker colours (green, blue, black & orange)
- Cast can be freely handled without breaking
Highly Organic SoilNoNOT Sufficient- High organic content (often decomposed)
- Plant remains/woody structure easily recognised
- Mineral soil finely divided with fibrous remains
- Occur in lowlands, swamps & swales
- Dark or black in colour
-

2. Pre-Installation Part 2

1. Excavation Process

When excavating be aware of:

a. The surroundings
Take care not to damage any underground services (telecommunication, electrical cables, water/sewer pipes, gas lines, etc).

b. The natural elements
If ground water is present in the excavation hole, continuously pump out the water during the installation process.

LOCATIONDESCRIPTIONEXCAVATION DEPTH
Soft in-situ soilFine sand, silt or clayMin 420mm/max 720mm deeper than the tank’s height
Non-load-bearing - No ground water will affect the tank
- No traffic will pass over the site
Min 120mm/max 720mm deeper than the tank’s height
Load-bearing- Ground water will affect the tank
- Traffic will pass over the site
Min 420mm/max 720mm deeper than the tank’s height

2. Prepare the tank bed

The bedding is the foundation on which the tank will be installed. The type and thickness of bedding will vary, choose the correct process relevant to your setup.

TYPETHICKNESSPROCESS
a. Rocks/rocky soils - Minimum 150mm crusher dust or a coarse sand/gravel mixture
- Bedding to be thicker where hollows or uneven areas are levelled out
- Remove all large/loose rocks and objects that could interfere
b. Dry installation
gravel/coarse sand (no ground water)
- 150mm crusher dust or a coarse sand/gravel mixture
- Stabilise bedding layer with 3% cement (1½ bags 50kg cement)
- Spread cement evenly and compact, using mechanical compactor
- Do no wet cement, as the natural moisture from the ground will do this over time
- If the soil is too dry to form a lump when pressed in your hand, add a little water but ensure lump still crumbles when lightly touched
c. Dry installation
soft in-situ soil – fine sand, silt or clay (no ground water)
- 2 x layers of 150mm crusher dust or a coarse sand/gravel mixture each
- Stabilise bedding layer with 3% cement (1½ bags 50kg cement)
- Spread cement evenly and compact, using mechanical compactor
- Do no wet cement, as the natural moisture from the ground will do this over time
- If the soil is too dry to form a lump when pressed in your hand, add a little water but ensure lump still crumbles when lightly touched
d. Wet installation (ground water will be present)- Drainage bedding layer of 150mm crushed rock (19mm), use crusher dust or a coarse sand/gravel mixture
- Stabilise bedding layer with 3% cement (1½ bags 50kg cement)
- Spread cement evenly and compact, using mechanical compactor
- Do no wet cement, as the natural moisture from the ground will do this over time
- If the soil is too dry to form a lump when pressed in your hand, add a little water but ensure lump still crumbles when lightly touched

Installation

3. Drill the hole for the Inlet

3. Drill the hole for the Inlet

Drill a hole in the designated area (see image above) with 111mm hole saw or a jig saw for pipe to enter at the top of the tank.

4. Inlet connection

4. Inlet connection

Fit pipe and elbow to inlet and seal with window putty or pan connector sealer to ensure no leakage once final installation is complete.

5. Place the tank

5. Place the tank

Carefully place the tank on top of the prepared bedding in the designated excavated area. Note the direction of flow (inlet) and place according to setup.

6. Backfill preparation

6. Backfill preparation

NB: the backfill procedure differs based on the size of the conservancy tank used. It is vital to follow the correct procedure to ensure the tank does not get damaged (refer to steps 7 to 8 for more detail).

7. Backfill for 6000lt

7. Backfill for 6000lt

For the 6000lt tank – Fill the tank with 150mm of water, then backfill 150mm around the perimeter of the tank. Compact the layer and repeat the process until at least half of the hole is filled.

8. Backfill for 1250lt to 2500lt

8. Backfill for 1250lt to 2500lt

For the smaller range – Fill the entire tank with water, then backfill in layers of 150mm around the perimeter of the tank, compacting each layer before laying the next. Continue until halfway.

9. Test compaction

9. Test compaction

Before commencing with the rest of the installation, it is vital to ensure that the soil is properly compacted.

10. Fill lid with concrete

10. Fill lid with concrete

Fill tank lid with concrete (allow concrete to cure) and put the lid in place.

11. Plumbing: house to tank

11. Plumbing: house to tank

Connect feed from house (black and grey water) to the elbow extending from the inlet at the top of the tank. Note: We recommend using a local plumber to handle all plumbing requirements.

12. Backfill 2nd half

12. Backfill 2nd half

Backfill the rest of the hole with suitable backfill material. Refer to steps 7 to 8 to ensure correct procedure is followed (depending on the size of the tank).

13. Recommendation

13. Recommendation

We recommend installing a manhole for easy access when necessary.

14. Recommendation

14. Recommendation

Find a local licensed hauling company and keep their contact details at hand.

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Install a JoJo Tank

Whether you’re looking for an installer or prefer the DIY-route, we’ve got all the information you need.

The installers listed below have been carefully screened to ensure that they have the right equipment and level of experience to provide you with satisfactory service.

If you’d prefer to install your own tank, please consult our comprehensive, easy-to-use DIY-Installation Guide.

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Why JoJo Tanks?

10 Year Warranty

Benefits

When you purchase a JoJo tank, you invest in a high-quality product from South Africa’s leading manufacturer of polyethylene tank solutions.

Our products offer the following benefits:

  • All JoJo products come with a 10-year guarantee (extended from an 8-year guarantee as of 1 September 2017).
  • Tanks are available in different formats, with a variety of fittings and accessories to extend performance capabilities and versatility.
  • Products are manufactured with the best food-grade, quality virgin LLDPE.
  • With a UV-stabilised outer layer, our products are designed to withstand the harsh African climate.
  • The food-grade, black inner lining in our water tanks prevents algae growth and keeps water fresher for longer.
  • A stringent quality-control system ensures that products meet specified design standards.
  • All JoJo Water and Chemical Tanks are manufactured in accordance with the specifications outlined in SANS 1731:2017*
  • All Vertical, Horizontal and Septic Tanks carry a quality certification from the Agrément Board of South Africa.

Find more information on our compliance to Industry Tank Standards here.

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FAQs

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Find the answers to your most Frequently Asked Questions.

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Storage Solutions

JoJo offers a wide range of storage solutions to suit every application – from domestic and agricultural to industrial and commercial.

Ranging in sizes from 260 litres to 20 000 litres, our storage tanks are suitable for storing a wide range of materials such as rainwater, chemicals, fertilisers, diesel, sewerage and more.

Resources

Find installation guides, brochures & specification sheets, our 10-year warranty and other important documents here.

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For enquiries contact 011 695 8300 or email productinfo@jojotanks.co.za

Address: 198 Howick Cl, Vorna Valley, Midrand, 1686