Improving DNA quality and yield from stool samples
Expected photometric ratios for pure DNA are around 1.8 (A260/A280) and 2.0-2.2 (A260/A230). For reference, if you are extracting pure RNA, its ratio is ideally 2.0 (A260/A280).

Often, lower ratios usually indicate low purity due to contaminants or simply a very low amount of DNA.

EDTA, carbs and phenol among other chemicals all have absorbance at 230nm. If you used TRIzol reagent to extract DNA, you may also get some absorbance from this reagent at 270nm if you incorrectly pipetted some of the phenol phase (pink stuff) or the interface (white cloudy stuff between the aqueous phase and the pink phase). If you measure a low ratio, like you did, it probably means that in your final DNA extract, you seem to have (a) things that are not DNA in your solution, and/or (b) a very low concentration of DNA.

If you suspect you have enough DNA, you can purify to try to remove non-nucleic acids. However, with ratios that low, I suspect you should extract DNA from scratch; it does not appear that you have enough to rescue simply by purifying again.

Which method did you use to extract your DNA? What do you mean by filtering?