# API 33G 5-in-1 Aquarium Test Strips, 25 Count

Count: API 33G 5-in-1 Test Strips are listed for monitoring freshwater and saltwater aquarium water. The five checks cover pH, nitrite, nitrate, carbonate and general hardness, with a colour chart for reading results.

- [Original product page](https://bargainpostbox.co.uk/product/api-33g-five-in-one-aquarium-test-strips)
- [View offer](https://bargainpostbox.co.uk/visit/api-33g-five-in-one-aquarium-test-strips)
- Market: UK
- Language: en-GB
- Currency: GBP
- Brand: API
- Model: 33G
- Category: Pet Supplies > Aquariums & Terrariums
- Price: 7.60 GBP
- Previous price: 14.90 GBP
- Discount: 49%
- Price checked: 2026-11-13T06:01:53.238Z
- Rating: 4.5 / 5
- Reviews: 12377

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## At a glance

- The listing describes five checks for aquarium water, including pH, nitrite, nitrate, carbonate and general hardness.
- Intended for freshwater and saltwater aquariums.
- Dip a strip into aquarium water and compare its colours with the chart.
- The listing recommends weekly monitoring and testing when water or fish problems appear.

## Pros

- One strip format covers several routine aquarium water checks.
- Suitable for both freshwater and saltwater aquarium use according to the listing.
- The dip-and-compare method is straightforward in principle.

## Specifications

### Product and testing
- Brand: API
- Model: 33G
- Water checks listed: pH, ammonium, nitrite, nitrate, hardness
- pH range: 6.0-8.0
- Aquarium types: freshwater and saltwater aquariums
- Material: white, non-woven material
### Dimensions and installation
- Weight listed: 0.1 Pounds

## Before you buy

- The water-check descriptions differ: one details list names pH, ammonium, nitrite, nitrate and hardness, while the feature text names pH, nitrite, nitrate, carbonate and general hardness. Confirm which parameters are covered by the selected product before relying on a particular test. Customer feedback also reports mixed ease of reading and accuracy, with some difficulty interpreting the colour chart.

## A good fit for

- Aquarium keepers wanting a compact set of routine water checks for freshwater or saltwater tanks.
- People who plan to monitor water regularly and can compare strip colours against a chart.

## Less suited to

- Buyers who need an explicitly confirmed test for a specific parameter until the listing's inconsistent parameter descriptions are clarified.
- Anyone who needs unambiguous numerical readings rather than colour-chart interpretation.

## Customer feedback

Customer feedback describes the strips as simple to use, reliable and effective for basic aquarium testing, and some appreciate quick testing. Reports are mixed on accuracy, readability, instructions and value, with colour-chart interpretation a specific concern. This matters because the product relies on comparing strip colours, so it may be less suitable for buyers who need consistently clear readings. The aggregate rating is generally favourable, but ratings alone do not establish measurement accuracy.
- Positive themes: Customers describe the strips as easy to use and reliable for basic aquarium testing.
- Positive themes: Some customers appreciate the quick testing process.
- Negative themes: Feedback identifies difficulty interpreting the colour chart.
- Mixed feedback: Customers disagree about readability and accuracy.
- Mixed feedback: Feedback on value and clarity of instructions is mixed.

## Frequently asked questions

### What water parameters do these strips test?
The listing is inconsistent. One details field names pH, ammonium, nitrite, nitrate and hardness, while the feature text names pH, nitrite, nitrate, carbonate and general hardness. Check the selected listing to confirm the exact set.
### Can they be used in freshwater and saltwater aquariums?
Yes, the product title and feature text describe use in both freshwater and saltwater aquariums.
### How many strips are included?
The product is listed as a 25-count box.
### How are the results read?
The instructions say to dip a strip into aquarium water and compare its colours. Customer feedback is mixed on readability and interpreting the colour chart.

## Alternative options

- [8 In 1 Aquarium Test Strips, 50 × Aquarium Water Test Kits \(Fish Tank/Pond\) \| Fish Tank Water Test Kit for Ammonia, pH, Nitrate, Nitrite, Chlorine, Total Hardness, Alkalinity and Carbonate](https://bargainpostbox.co.uk/visit/api-33g-five-in-one-aquarium-test-strips)
- [AAwipes Aquarium Test Strips 8-in-1, Fish Tank Water Test Kit, 50 Strips \| Fish Tank Test Strips for Freshwater, Saltwater & Ponds; Tests pH, Nitrate, Nitrite, Hardness, Chlorine & Ammonia](https://bargainpostbox.co.uk/visit/api-33g-five-in-one-aquarium-test-strips)
- [8 In 1 Aquarium Test Strips, 150 × Pond Test Kit for Freshwater & Saltwater \| Fish Tank Test Strips for Ammonia, pH, Nitrate, Nitrite, Chlorine, Total Hardness, Alkalinity and Carbonate](https://bargainpostbox.co.uk/visit/api-33g-five-in-one-aquarium-test-strips)
- [EASYTEST 6 in 1 Aquarium Test Strips, 150 Strip Pack Aquarium Water Test Kit for Freshwater, Fish Tank, Fish Pond, Accurate Testing Total Hardness, Carbonate Nitrate, Nitrite, Cl2, pH](https://bargainpostbox.co.uk/visit/api-33g-five-in-one-aquarium-test-strips)
- [Mnuwoee 11-in-1 Aquarium Test Kit, Fish Tank Pond Water Testing Strips \| 50Pcs Aquarium Water Test Kits for Ammonia Hardness pH More, Reliable and Convenient for Pond Aquariums Tanks](https://bargainpostbox.co.uk/visit/api-33g-five-in-one-aquarium-test-strips)
- [Dr.Deutsch 7-in-1 Pool Test Strips 150 Count, Hot Tub & Spa Water Testing Kit for Bromine, pH, Total Alkalinity, Free Chlorine, Total Hardness, Cyanuric Acid & Total Chlorine, Pool Tester CE UKCA ISO](https://bargainpostbox.co.uk/visit/api-33g-five-in-one-aquarium-test-strips)
- [7 in 1 Aquarium Test Strips, 125ct Freshwater Saltwater Fish Tank Test Kit \| Pond Water Testing Kit Aquarium for Chlorine, Total Hardness, Carbonate, Alkalinity, Nitrate, Nitrite and pH](https://bargainpostbox.co.uk/visit/api-33g-five-in-one-aquarium-test-strips)
- [DIPSTIK Aquarium Test Strips, 7-Way Freshwater Saltwater Fish Tank Pond Test Kit, 100 Strips, Nitrate, Nitrite, Chlorine, Hardness, Alkalinity, Carbonate, pH](https://bargainpostbox.co.uk/visit/api-33g-five-in-one-aquarium-test-strips)
- [EASYTEST 9-in-1 Aquarium Test Strips - 150PCS Fish Tank Water Kit to Detect Total Hardness, PH, Nitrite, Nitrate, Chlorine, Alkalinity, Carbonate, Iron and Copper - Easy & Fast](https://bargainpostbox.co.uk/visit/api-33g-five-in-one-aquarium-test-strips)
- [API Aquarium Test Kit Bundle 5-in-1 + Ammonia 25 Strips pH Nitrite Nitrate GH KH](https://bargainpostbox.co.uk/visit/api-33g-five-in-one-aquarium-test-strips)
- [150Pcs 7-in-1 Aquarium Test Strips, Freshwater Saltwater Fish Tank Test Kit \| Aquarium Water Test Kit for Free Chlorine, Ammonia Nitrogen, Nitrate, Nitrite, Carbonate, pH, Test Strips for Pools Pond](https://bargainpostbox.co.uk/visit/api-33g-five-in-one-aquarium-test-strips)
- [Adiwo Aquarium Test Strips, 7 in 1 Fish Tank Test Kit, Freshwater Saltwater Aquarium Water Test Kit to Detect pH Nitrite Nitrate Chlorine Carbonate Hardness, Testable in 60 seconds \(GH & KH\) \(100 Pcs\)](https://bargainpostbox.co.uk/visit/api-33g-five-in-one-aquarium-test-strips)

## Add-ons

- [AQUARIAN Tap Water Safe Fish Aquarium Water Conditioner, 118 ml Bottle](https://bargainpostbox.co.uk/visit/api-33g-five-in-one-aquarium-test-strips)
- [QZQ Fish Tank Thermometer Aquarium Thermometer Digital Wireless Touch Stick LED Display ±1°C for Monitoring The Fish Tank Aquarium Temperature Accessories](https://bargainpostbox.co.uk/visit/api-33g-five-in-one-aquarium-test-strips)

## Images

![API 33G 5-in-1 Aquarium Test Strips, 25 Count — 1](https://bargainpostbox.co.uk/i/7gHlIMWsdAgJW2cKYZ3QMZjQqpxeYuJX1l2OxskB_o3o-KcVQ-9jQnQ5bG7Z1HDsAVPv0sqd7J_Hs1jMWzU3vTdZDdyGJxUDv-6ohODbLBoz23F5AC76l3Bi.jpg)

![API 33G 5-in-1 Aquarium Test Strips, 25 Count — 2](https://bargainpostbox.co.uk/i/3Dg65c0fVTArrtbKRBGAsZSFsIw4mjzR_uu8s_s4d1iVL26WeOExwXfiXgQwNhAFTwm5_U8Yq0mK8_-N7y9OvfiHqtX4A9gTfaNgyco77IzELLCW6RUJHIRH.jpg)

![API 33G 5-in-1 Aquarium Test Strips, 25 Count — 3](https://bargainpostbox.co.uk/i/uAlirJZl-flCt5MFjNJ90yDpoFyQN5h2KSumzt4h15zucAYMyJ_-Wvd7rfI4R5fx4xrNGKhKmvNd4kAMKsxHXvx-qIVznPyiZqYQsFU9krU2GtmTJLb1JNLG.jpg)

![API 33G 5-in-1 Aquarium Test Strips, 25 Count — 4](https://bargainpostbox.co.uk/i/OO3Q45ZPI5opLpybbFvbZK74EdoBK14uxs1SbUjDpZVJfAxIuqaRyvLoaSLDFBMZ216uG3oy1MhvEgOBnP85YMrbtbV9YB1WmfdjU_HBW-8tN9aoK8--YISy.jpg)

![API 33G 5-in-1 Aquarium Test Strips, 25 Count — 5](https://bargainpostbox.co.uk/i/naXodbw-jUx4852Lq_CyeMyq2-wNBrHCHdyIq2ZSltii0gB7XBj9lXLMeWAHqrn_DN_UMReAYehCdydMwa2I2jcWnCBgAPega0UK_0SYdBuwnG7sdG2Rg-Zn.jpg)

![API 33G 5-in-1 Aquarium Test Strips, 25 Count — 6](https://bargainpostbox.co.uk/i/Qwn-Ki5da6IrdraVEEQdNSnX_nVLu7NBnH7lbFQk6T3B8lmRgF19tlVHROqUTSiKwMuDy1ACEJc7Yqo97lmcbrJ0ceOsN0YK80BhRyOhlyvUq_FeNqzIhvbr.jpg)

![API 33G 5-in-1 Aquarium Test Strips, 25 Count — 7](https://bargainpostbox.co.uk/i/xM0hXknGq_2NI6ZKvN45L6EFuDDOFmpgOqld7djII-BpRkf4pLMN19_QsVYtGrmB0ILlw7OBT7tKxriWmRjgN7G2-Sy1EqlxYFk41MjDKSu1y3JnqvaBevnm.jpg)