Clearwater Filter Cartridge Cleaner Hot Tub, Spa & Pool 800ml (1KG)

Absolutely brilliant! Well worth it! Wash off what you can first then use this soaking it overnight. I rinse off with the shower again after and it comes out great! Only used this once so far but felt I needed to put a review will be doing the other filter later once I swap them over! Just fab!

This product is awesome. Before and after pics show just how great it is. Filter cartridge on the right soaked in chlorine, one on the left is before and after using this product (soaked for 24hrs using the bottom half of a 4 pint milk carton), amazing results and costs about 80p per filter clean.

Use for cleaning my Lazy Spa filters. First, I rinse the filter using a garden hose to get rid of any debris (or sometimes, just the kitchen tap). I have cut the base off a 3L lemonade bottle and use this as my container to soak the filter. I put in 50ml of the cartridge cleaner, then top up with 1L of water. Drop the filter into the cleaning solution and leave to soak for 24hrs. As there isn't enough water to make the filter too buoyant, I don't need to worry about weighing it down. After 24hrs, just tip into the sink and rinse. Doesn't come up shiny white, but removes the grease etc and makes the filter considerably whiter than before cleaning! I leave the filter to dry before using again. I have just two filters, and swap out the dirty for the clean filter each time (usually once a week). Using just 50ml of cleaning solution, I get 20 'cleans' out of the bottle, which makes it considerably cheaper than using a new filter every time.

Really good product. Soaking with some water in a bowl overnight and you have a new white filter. Brilliant stuff.

Bought and used multiple times over the last 3 years. Very effective. Saves money on filters and cuts the number of used filters going to landfill.

Done the job very well, filters look almost brand new again

I am a new hot tub owner and wasn't sure whether to purchase this product or not. We left our first filter in for a week - OMG it was so dirty when it came out and really green, we tried to clean it and decided it was cheaper to replace the filter each time so we ordered 24 filters. Realising that a week was too long we started changing it every 2 to 3 days, the filter then wasn't green but it wasn't completely white either so I ordered a bottle to try. When it came we found an old plant pot holder, just wider than the width of the filter, which holds the filter, a litre of water and 50mls of solution, we washed and put our first filter in, it came out looking like new. Our plan was use it to clean one filter and then replace it but I took a filter out of the spa just as I was going to remove the first filter from the solution so I washed the loose debris from the filter and dropped it into the 'used' solution, left it overnight next day took it out and it was completely clean. This time I tried three filters - I wash the loose debris off filters as I remove them from the pool and then kept them until I have two to clean, I put one in after the other, both of them came out completely clean. Yesterday I took another filter out of the pool and it was a bit green so I washed the loose debris off and dropped it in to the already double used solution. This filter was by far the worst we have added to the solution and when I checked it this morning it was completely clean. (See the picture) My tip is find a container that will take the filter, solution and litre of water and then try reusing the solution. My container is just wide enough to take the filter.

I had been cleaning my filters with water, which works quite well but I wanted to be sure they were really clean. I expected them to be sparkling white after using this product, but they don't really look any different.